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Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Jun. 25, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |
Commitment fee percentage on unused portion of the commitment | 0.175%us-gaap_LineOfCreditFacilityCommitmentFeePercentage |  |
Outstanding amount under revolving credit agreement | $ 303,199 us-gaap_LongTermLineOfCredit |  | $ 230,044 us-gaap_LongTermLineOfCredit
Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee percentage on unused portion of the commitment |  | 0.125%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee percentage on unused portion of the commitment |  | 0.35%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |
Before Extension |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit agreement maximum borrowing capacity |  | 500,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = wso_BeforeExtensionMember |
Revolving credit agreement maturity date |  | Jul. 01, 2018 |
After Extension |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit agreement maximum borrowing capacity |  | 600,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = wso_AfterExtensionMember |
Revolving credit agreement maturity date |  | Jul. 01, 2019 |
London Interbank Offer Rate |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |
London Interbank Offer Rate | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread |  | 0.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
London Interbank Offer Rate | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread |  | 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
Prime Rate |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread | 0.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_VariableRateAxis = us-gaap_PrimeRateMember |  |
Prime Rate | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread |  | 0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_PrimeRateMember |
Prime Rate | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread |  | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_PrimeRateMember |
Swingline Subfacility | Before Extension |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit agreement maximum borrowing capacity |  | 65,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = wso_SwinglineSubfacilityMember / us-gaap_DebtInstrumentAxis = wso_BeforeExtensionMember |
Swingline Subfacility | After Extension |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit agreement maximum borrowing capacity |  | 90,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = wso_SwinglineSubfacilityMember / us-gaap_DebtInstrumentAxis = wso_AfterExtensionMember |
Letter of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit agreement maximum borrowing capacity |  | 50,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember |
Multicurrency borrowing sublimit |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit agreement maximum borrowing capacity |  | 75,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = wso_MulticurrencyBorrowingSublimitMember |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Balance Type: | na
Period Type: | duration

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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1314-112600 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1336-112600 + Details
Name: | us-gaap_LongTermLineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=wso_MulticurrencyBorrowingSublimitMember
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Period Type: |

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- Details
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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