    <SEC-DOCUMENT>0000874238-23-000120-index.html : 20231116
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    <ACCEPTANCE-DATETIME>20231116161046
    ACCESSION NUMBER:		0000874238-23-000120
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		15
    CONFORMED PERIOD OF REPORT:	20231116
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20231116
    DATE AS OF CHANGE:		20231116

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			STERLING INFRASTRUCTURE, INC.
    		CENTRAL INDEX KEY:			0000874238
    		STANDARD INDUSTRIAL CLASSIFICATION:	HEAVY CONSTRUCTION OTHER THAN BUILDING CONST - CONTRACTORS [1600]
    		IRS NUMBER:				251655321
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-31993
    		FILM NUMBER:		231414696

    	BUSINESS ADDRESS:
    		STREET 1:		1800 HUGHES LANDING BLVD.
    		STREET 2:		SUITE 250
    		CITY:			THE WOODLANDS
    		STATE:			TX
    		ZIP:			77380
    		BUSINESS PHONE:		281-214-0777

    	MAIL ADDRESS:
    		STREET 1:		1800 HUGHES LANDING BLVD.
    		STREET 2:		SUITE 250
    		CITY:			THE WOODLANDS
    		STATE:			TX
    		ZIP:			77380

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	STERLING CONSTRUCTION CO INC
    		DATE OF NAME CHANGE:	20020329

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	OAKHURST CO INC
    		DATE OF NAME CHANGE:	19950831

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	OAKHURST CAPITAL INC
    		DATE OF NAME CHANGE:	19931130
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>strl-20231116.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: strl-20231116.htm

    </DOCUMENT>
    <DOCUMENT>
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    <SEQUENCE>2
    <FILENAME>a20231116ex991pressrelease.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
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    <SEQUENCE>3
    <FILENAME>strl-20231116.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
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    <TYPE>EX-101.PRE
    <SEQUENCE>5
    <FILENAME>strl-20231116_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
    <TEXT>
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    <SEQUENCE>6
    <FILENAME>sterlinginfrainclogo_4c.jpg
    <DESCRIPTION>GRAPHIC
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    <FILENAME>strl-20231116_g1.jpg
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    <SEQUENCE>8
    <FILENAME>R1.htm
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    <TEXT>
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    <TYPE>XML
    <SEQUENCE>9
    <FILENAME>strl-20231116_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
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    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>10
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 10 - file: Financial_Report.xlsx

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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>11
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    <SEQUENCE>12
    <FILENAME>report.css
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    <TEXT>
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    <TYPE>XML
    <SEQUENCE>13
    <FILENAME>FilingSummary.xml
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    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>15
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
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    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>16
    <FILENAME>0000874238-23-000120-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
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