<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.22.0.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>431</ContextCount>
  <ElementCount>556</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>141</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>10</UnitCount>
  <MyReports>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001001 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0002002 - Document - Audit Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/AuditInformation</Role>
      <ShortName>Audit Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1001003 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/CONSOLIDATEDBALANCESHEETS</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1002004 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/CONSOLIDATEDBALANCESHEETSParenthetical</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1003005 - Statement - CONSOLIDATED STATEMENTS OF INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/CONSOLIDATEDSTATEMENTSOFINCOME</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1004006 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>1005007 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>1006008 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>1007009 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2101101 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/SummaryofSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2104102 - Disclosure - Revenue</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/Revenue</Role>
      <ShortName>Revenue</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2107103 - Disclosure - Acquisitions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/Acquisitions</Role>
      <ShortName>Acquisitions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2109104 - Disclosure - RATIONALIZATION CHARGES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/RATIONALIZATIONCHARGES</Role>
      <ShortName>RATIONALIZATION CHARGES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2114105 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE LOSS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/ACCUMULATEDOTHERCOMPREHENSIVELOSS</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE LOSS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2118106 - Disclosure - INVENTORIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/INVENTORIES</Role>
      <ShortName>INVENTORIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2122107 - Disclosure - PROPERTY, PLANT AND EQUIPMENT, NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/PROPERTYPLANTANDEQUIPMENTNET</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT, NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2125108 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS, NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/GOODWILLANDOTHERINTANGIBLEASSETSNET</Role>
      <ShortName>GOODWILL AND OTHER INTANGIBLE ASSETS, NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2130109 - Disclosure - LONG-TERM DEBT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/LONGTERMDEBT</Role>
      <ShortName>LONG-TERM DEBT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2140110 - Disclosure - FINANCIAL INSTRUMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/FINANCIALINSTRUMENTS</Role>
      <ShortName>FINANCIAL INSTRUMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2144111 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/COMMITMENTSANDCONTINGENCIES</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2148112 - Disclosure - RETIREMENT BENEFITS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/RETIREMENTBENEFITS</Role>
      <ShortName>RETIREMENT BENEFITS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2160113 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/INCOMETAXES</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2168114 - Disclosure - STOCK-BASED COMPENSATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/STOCKBASEDCOMPENSATION</Role>
      <ShortName>STOCK-BASED COMPENSATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2172115 - Disclosure - CAPITAL STOCK</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/CAPITALSTOCK</Role>
      <ShortName>CAPITAL STOCK</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2174116 - Disclosure - EARNINGS PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/EARNINGSPERSHARE</Role>
      <ShortName>EARNINGS PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>2177117 - Disclosure - BUSINESS SEGMENT INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/BUSINESSSEGMENTINFORMATION</Role>
      <ShortName>BUSINESS SEGMENT INFORMATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2184118 - Disclosure - SUBSEQUENT EVENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/SUBSEQUENTEVENT</Role>
      <ShortName>SUBSEQUENT EVENT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2186119 - Disclosure - SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/SCHEDULEIIVALUATIONANDQUALIFYINGACCOUNTS</Role>
      <ShortName>SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2202201 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/SummaryofSignificantAccountingPolicies</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2305301 - Disclosure - REVENUE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/REVENUETables</Role>
      <ShortName>REVENUE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2310302 - Disclosure - RATIONALIZATION CHARGES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/RATIONALIZATIONCHARGESTables</Role>
      <ShortName>RATIONALIZATION CHARGES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/RATIONALIZATIONCHARGES</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2315303 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/ACCUMULATEDOTHERCOMPREHENSIVELOSSTables</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/ACCUMULATEDOTHERCOMPREHENSIVELOSS</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2319304 - Disclosure - INVENTORIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/INVENTORIESTables</Role>
      <ShortName>INVENTORIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/INVENTORIES</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2323305 - Disclosure - PROPERTY, PLANT AND EQUIPMENT, NET (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/PROPERTYPLANTANDEQUIPMENTNETTables</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT, NET (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/PROPERTYPLANTANDEQUIPMENTNET</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2326306 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS, NET (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/GOODWILLANDOTHERINTANGIBLEASSETSNETTables</Role>
      <ShortName>GOODWILL AND OTHER INTANGIBLE ASSETS, NET (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/GOODWILLANDOTHERINTANGIBLEASSETSNET</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2331307 - Disclosure - LONG-TERM DEBT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/LONGTERMDEBTTables</Role>
      <ShortName>LONG-TERM DEBT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/LONGTERMDEBT</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2341308 - Disclosure - FINANCIAL INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/FINANCIALINSTRUMENTSTables</Role>
      <ShortName>FINANCIAL INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/FINANCIALINSTRUMENTS</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2345309 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/COMMITMENTSANDCONTINGENCIESTables</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/COMMITMENTSANDCONTINGENCIES</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2349310 - Disclosure - RETIREMENT BENEFITS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/RETIREMENTBENEFITSTables</Role>
      <ShortName>RETIREMENT BENEFITS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/RETIREMENTBENEFITS</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2361311 - Disclosure - INCOME TAXES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/INCOMETAXESTables</Role>
      <ShortName>INCOME TAXES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/INCOMETAXES</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2369312 - Disclosure - STOCK-BASED COMPENSATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/STOCKBASEDCOMPENSATIONTables</Role>
      <ShortName>STOCK-BASED COMPENSATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/STOCKBASEDCOMPENSATION</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2375313 - Disclosure - EARNINGS PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/EARNINGSPERSHARETables</Role>
      <ShortName>EARNINGS PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/EARNINGSPERSHARE</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2378314 - Disclosure - BUSINESS SEGMENT INFORMATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/BUSINESSSEGMENTINFORMATIONTables</Role>
      <ShortName>BUSINESS SEGMENT INFORMATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/BUSINESSSEGMENTINFORMATION</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>2403401 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAdditionalInformationDetail</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>2406402 - Disclosure - REVENUE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/REVENUEDetails</Role>
      <ShortName>REVENUE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/REVENUETables</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>2408403 - Disclosure - ACQUISITIONS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/ACQUISITIONSNarrativeDetails</Role>
      <ShortName>ACQUISITIONS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>2411404 - Disclosure - RATIONALIZATION CHARGES - Rationalization Charge by Business Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/RATIONALIZATIONCHARGESRationalizationChargebyBusinessSegmentDetails</Role>
      <ShortName>RATIONALIZATION CHARGES - Rationalization Charge by Business Segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>2412405 - Disclosure - RATIONALIZATION CHARGES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/RATIONALIZATIONCHARGESNarrativeDetails</Role>
      <ShortName>RATIONALIZATION CHARGES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>2413406 - Disclosure - RATIONALIZATION CHARGES - Activity in Rationalization Plan Reserves (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/RATIONALIZATIONCHARGESActivityinRationalizationPlanReservesDetail</Role>
      <ShortName>RATIONALIZATION CHARGES - Activity in Rationalization Plan Reserves (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>2416407 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE LOSS - Amounts Included in Accumulated Other Comprehensive Loss (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/ACCUMULATEDOTHERCOMPREHENSIVELOSSAmountsIncludedinAccumulatedOtherComprehensiveLossDetail</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE LOSS - Amounts Included in Accumulated Other Comprehensive Loss (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>2417408 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE LOSS - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/ACCUMULATEDOTHERCOMPREHENSIVELOSSAdditionalInformationDetail</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE LOSS - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>2420409 - Disclosure - INVENTORIES (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/INVENTORIESDetail</Role>
      <ShortName>INVENTORIES (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/INVENTORIESTables</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>2421410 - Disclosure - INVENTORIES - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/INVENTORIESAdditionalInformationDetail</Role>
      <ShortName>INVENTORIES - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>2424411 - Disclosure - PROPERTY, PLANT AND EQUIPMENT, NET (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/PROPERTYPLANTANDEQUIPMENTNETDetail</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT, NET (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/PROPERTYPLANTANDEQUIPMENTNETTables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>2427412 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Changes in Carrying Amount of Goodwill (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/GOODWILLANDOTHERINTANGIBLEASSETSNETChangesinCarryingAmountofGoodwillDetail</Role>
      <ShortName>GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Changes in Carrying Amount of Goodwill (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>2428413 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Components of Other Intangible Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/GOODWILLANDOTHERINTANGIBLEASSETSNETComponentsofOtherIntangibleAssetsDetail</Role>
      <ShortName>GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Components of Other Intangible Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>2429414 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/GOODWILLANDOTHERINTANGIBLEASSETSNETAdditionalInformationDetail</Role>
      <ShortName>GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>2432415 - Disclosure - LONG-TERM DEBT - Summary of Long-Term Debt (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/LONGTERMDEBTSummaryofLongTermDebtDetail</Role>
      <ShortName>LONG-TERM DEBT - Summary of Long-Term Debt (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>2433416 - Disclosure - LONG-TERM DEBT - Aggregate Annual Maturities of Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/LONGTERMDEBTAggregateAnnualMaturitiesofDebtDetails</Role>
      <ShortName>LONG-TERM DEBT - Aggregate Annual Maturities of Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>2434417 - Disclosure - LONG-TERM DEBT - Bank Credit Agreements (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/LONGTERMDEBTBankCreditAgreementsDetail</Role>
      <ShortName>LONG-TERM DEBT - Bank Credit Agreements (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>2435418 - Disclosure - LONG-TERM DEBT - 1.4% Senior Secured Notes (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.silganholdings.com/role/LONGTERMDEBT14SeniorSecuredNotesDetails</Role>
      <ShortName>LONG-TERM DEBT - 1.4% Senior Secured Notes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>2436419 - Disclosure - LONG-TERM DEBT - 2 1/4% Senior Notes (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.silganholdings.com/role/LONGTERMDEBT214SeniorNotesDetails</Role>
      <ShortName>LONG-TERM DEBT - 2 1/4% Senior Notes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>2437420 - Disclosure - LONG-TERM DEBT - 4 1/8% Senior Notes (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.silganholdings.com/role/LONGTERMDEBT418SeniorNotesDetails</Role>
      <ShortName>LONG-TERM DEBT - 4 1/8% Senior Notes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>2438421 - Disclosure - LONG-TERM DEBT - 4 3/4% and 3 1/4% Senior Notes (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.silganholdings.com/role/LONGTERMDEBT434and314SeniorNotesDetails</Role>
      <ShortName>LONG-TERM DEBT - 4 3/4% and 3 1/4% Senior Notes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>2439422 - Disclosure - LONG-TERM DEBT - 5 1/2% Senior Notes (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.silganholdings.com/role/LONGTERMDEBT512SeniorNotesDetails</Role>
      <ShortName>LONG-TERM DEBT - 5 1/2% Senior Notes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>2442423 - Disclosure - FINANCIAL INSTRUMENTS - Summary of Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/FINANCIALINSTRUMENTSSummaryofCarryingAmountsandEstimatedFairValuesofOtherFinancialInstrumentsDetail</Role>
      <ShortName>FINANCIAL INSTRUMENTS - Summary of Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>2443424 - Disclosure - FINANCIAL INSTRUMENTS - Narrative (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/FINANCIALINSTRUMENTSNarrativeDetail</Role>
      <ShortName>FINANCIAL INSTRUMENTS - Narrative (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>2446425 - Disclosure - COMMITMENTS AND CONTINGENCIES - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/COMMITMENTSANDCONTINGENCIESAdditionalInformationDetail</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>2447426 - Disclosure - COMMITMENTS AND CONTINGENCIES - Aggregate Maturities of Operating and Finance Lease Liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/COMMITMENTSANDCONTINGENCIESAggregateMaturitiesofOperatingandFinanceLeaseLiabilitiesDetail</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Aggregate Maturities of Operating and Finance Lease Liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>2450427 - Disclosure - RETIREMENT BENEFITS - Changes in Benefit Obligations and Plan Assets as Well as Funded Status of Retirement Plans (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/RETIREMENTBENEFITSChangesinBenefitObligationsandPlanAssetsasWellasFundedStatusofRetirementPlansDetail</Role>
      <ShortName>RETIREMENT BENEFITS - Changes in Benefit Obligations and Plan Assets as Well as Funded Status of Retirement Plans (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>2451428 - Disclosure - RETIREMENT BENEFITS - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/RETIREMENTBENEFITSAdditionalInformationDetail</Role>
      <ShortName>RETIREMENT BENEFITS - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>2452429 - Disclosure - RETIREMENT BENEFITS - Benefits Expected to Be Paid from Pension and Other Postretirement Benefit Plans, Which Reflect Future Years of Services (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/RETIREMENTBENEFITSBenefitsExpectedtoBePaidfromPensionandOtherPostretirementBenefitPlansWhichReflectFutureYearsofServicesDetail</Role>
      <ShortName>RETIREMENT BENEFITS - Benefits Expected to Be Paid from Pension and Other Postretirement Benefit Plans, Which Reflect Future Years of Services (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>2453430 - Disclosure - RETIREMENT BENEFITS - Weighted Average Actuarial Assumptions to Determine Benefit Obligations (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/RETIREMENTBENEFITSWeightedAverageActuarialAssumptionstoDetermineBenefitObligationsDetail</Role>
      <ShortName>RETIREMENT BENEFITS - Weighted Average Actuarial Assumptions to Determine Benefit Obligations (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>2454431 - Disclosure - RETIREMENT BENEFITS - Components of Net Periodic Benefit Cost (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/RETIREMENTBENEFITSComponentsofNetPeriodicBenefitCostDetail</Role>
      <ShortName>RETIREMENT BENEFITS - Components of Net Periodic Benefit Cost (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>2455432 - Disclosure - RETIREMENT BENEFITS - Weighted Average Actuarial Assumptions to Determine Net Period Cost (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/RETIREMENTBENEFITSWeightedAverageActuarialAssumptionstoDetermineNetPeriodCostDetail</Role>
      <ShortName>RETIREMENT BENEFITS - Weighted Average Actuarial Assumptions to Determine Net Period Cost (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>2457434 - Disclosure - RETIREMENT BENEFITS - Multiemployer Pension Plans (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/RETIREMENTBENEFITSMultiemployerPensionPlansDetail</Role>
      <ShortName>RETIREMENT BENEFITS - Multiemployer Pension Plans (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>2458435 - Disclosure - RETIREMENT BENEFITS - Weighted Average Asset Allocation for Pension Plans and Target Allocation (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/RETIREMENTBENEFITSWeightedAverageAssetAllocationforPensionPlansandTargetAllocationDetail</Role>
      <ShortName>RETIREMENT BENEFITS - Weighted Average Asset Allocation for Pension Plans and Target Allocation (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>2459436 - Disclosure - RETIREMENT BENEFITS - Fair Value of Plan Assets by Asset Category (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/RETIREMENTBENEFITSFairValueofPlanAssetsbyAssetCategoryDetail</Role>
      <ShortName>RETIREMENT BENEFITS - Fair Value of Plan Assets by Asset Category (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>2462437 - Disclosure - INCOME TAXES - Income Before Income Taxes (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/INCOMETAXESIncomeBeforeIncomeTaxesDetail</Role>
      <ShortName>INCOME TAXES - Income Before Income Taxes (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>2463438 - Disclosure - INCOME TAXES - Components of Provision for Income Taxes (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/INCOMETAXESComponentsofProvisionforIncomeTaxesDetail</Role>
      <ShortName>INCOME TAXES - Components of Provision for Income Taxes (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>2464439 - Disclosure - INCOME TAXES - Variation of Provision for Income Taxes from Statutory U.S. Federal Income Tax Rate (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/INCOMETAXESVariationofProvisionforIncomeTaxesfromStatutoryUSFederalIncomeTaxRateDetail</Role>
      <ShortName>INCOME TAXES - Variation of Provision for Income Taxes from Statutory U.S. Federal Income Tax Rate (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>2465440 - Disclosure - INCOME TAXES - Significant Components of Deferred Tax Assets and Liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/INCOMETAXESSignificantComponentsofDeferredTaxAssetsandLiabilitiesDetail</Role>
      <ShortName>INCOME TAXES - Significant Components of Deferred Tax Assets and Liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>2466441 - Disclosure - INCOME TAXES - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/INCOMETAXESAdditionalInformationDetails</Role>
      <ShortName>INCOME TAXES - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>2467442 - Disclosure - INCOME TAXES - Reconciliation of Beginning and Ending Amount of Gross Unrecognized Tax Benefits (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/INCOMETAXESReconciliationofBeginningandEndingAmountofGrossUnrecognizedTaxBenefitsDetail</Role>
      <ShortName>INCOME TAXES - Reconciliation of Beginning and Ending Amount of Gross Unrecognized Tax Benefits (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>2470443 - Disclosure - STOCK-BASED COMPENSATION - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/STOCKBASEDCOMPENSATIONAdditionalInformationDetail</Role>
      <ShortName>STOCK-BASED COMPENSATION - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>2471444 - Disclosure - STOCK-BASED COMPENSATION - Summary of Restricted Stock Unit Activity (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/STOCKBASEDCOMPENSATIONSummaryofRestrictedStockUnitActivityDetail</Role>
      <ShortName>STOCK-BASED COMPENSATION - Summary of Restricted Stock Unit Activity (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>2473445 - Disclosure - CAPITAL STOCK - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/CAPITALSTOCKAdditionalInformationDetail</Role>
      <ShortName>CAPITAL STOCK - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>2476446 - Disclosure - EARNINGS PER SHARE - Components of Calculation of Earnings Per Share (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/EARNINGSPERSHAREComponentsofCalculationofEarningsPerShareDetail</Role>
      <ShortName>EARNINGS PER SHARE - Components of Calculation of Earnings Per Share (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>2479447 - Disclosure - BUSINESS SEGMENT INFORMATION - Reportable Business Segment Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/BUSINESSSEGMENTINFORMATIONReportableBusinessSegmentInformationDetail</Role>
      <ShortName>BUSINESS SEGMENT INFORMATION - Reportable Business Segment Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>2480448 - Disclosure - BUSINESS SEGMENT INFORMATION - Reconciliation of Segment Income from Operations to Income before Income Taxes (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/BUSINESSSEGMENTINFORMATIONReconciliationofSegmentIncomefromOperationstoIncomebeforeIncomeTaxesDetail</Role>
      <ShortName>BUSINESS SEGMENT INFORMATION - Reconciliation of Segment Income from Operations to Income before Income Taxes (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>2481449 - Disclosure - BUSINESS SEGMENT INFORMATION - Reconciliation of Total Segment Assets to Total Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/BUSINESSSEGMENTINFORMATIONReconciliationofTotalSegmentAssetstoTotalAssetsDetail</Role>
      <ShortName>BUSINESS SEGMENT INFORMATION - Reconciliation of Total Segment Assets to Total Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>2482450 - Disclosure - BUSINESS SEGMENT INFORMATION - Financial Information Relating to Operations by Geographic Area (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/BUSINESSSEGMENTINFORMATIONFinancialInformationRelatingtoOperationsbyGeographicAreaDetail</Role>
      <ShortName>BUSINESS SEGMENT INFORMATION - Financial Information Relating to Operations by Geographic Area (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>2483451 - Disclosure - BUSINESS SEGMENT INFORMATION - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/BUSINESSSEGMENTINFORMATIONAdditionalInformationDetail</Role>
      <ShortName>BUSINESS SEGMENT INFORMATION - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>2485452 - Disclosure - SUBSEQUENT EVENT (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/SUBSEQUENTEVENTDetails</Role>
      <ShortName>SUBSEQUENT EVENT (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/SUBSEQUENTEVENT</ParentRole>
      <Position>94</Position>
    </Report>
    <Report instance="slgn-20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>2487453 - Disclosure - SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.silganholdings.com/role/SCHEDULEIIVALUATIONANDQUALIFYINGACCOUNTSDetail</Role>
      <ShortName>SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.silganholdings.com/role/SCHEDULEIIVALUATIONANDQUALIFYINGACCOUNTS</ParentRole>
      <Position>95</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-K" original="slgn-20211231.htm">slgn-20211231.htm</File>
    <File>ex-21x20211231.htm</File>
    <File>ex-22x20211231.htm</File>
    <File>ex-23x20211231.htm</File>
    <File>ex-311x20211231.htm</File>
    <File>ex-312x20211231.htm</File>
    <File>ex-321x20211231.htm</File>
    <File>ex-322x20211231.htm</File>
    <File>ex-413x20211231.htm</File>
    <File>ex-416x20211231.htm</File>
    <File>ex-43x20211231.htm</File>
    <File>ex-49x20211231.htm</File>
    <File>slgn-20211231.xsd</File>
    <File>slgn-20211231_cal.xml</File>
    <File>slgn-20211231_def.xml</File>
    <File>slgn-20211231_lab.xml</File>
    <File>slgn-20211231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="1">http://fasb.org/srt/2021-01-31</BaseTaxonomy>
    <BaseTaxonomy items="1390">http://fasb.org/us-gaap/2021-01-31</BaseTaxonomy>
    <BaseTaxonomy items="36">http://xbrl.sec.gov/dei/2021q4</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
