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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Taxes [Line Items] |  |  |  |
Percentage of income attributable to wholly-owned operations and investments for which income tax expense and effective tax rate calculated | 100.00%wso_PercentOfOperationAndInvestmentIncomeForWhichIncomeTaxExpenseAndEffectiveTaxRateCalculated |  |  |
Undistributed earnings of foreign subsidiaries | $ 80,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |  |
Valuation allowance |  | 75 us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent |  |
State and other net operating loss carry forwards | 7,231 us-gaap_OperatingLossCarryforwards |  |  |
Gross unrecognized tax benefits | 3,719 us-gaap_UnrecognizedTaxBenefits | 3,135 us-gaap_UnrecognizedTaxBenefits | 2,474 us-gaap_UnrecognizedTaxBenefits | 2,424 us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that, if recognized, would affect the effective tax rate | 2,417 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 2,038 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |
Estimated accrued interest and penalties resulting from unrecognized tax benefits | $ 729 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | $ 630 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |
Minimum |  |  |  |
Income Taxes [Line Items] |  |  |  |
State and other net operating loss carry forwards expiration date | 2015 |  |  |
Maximum |  |  |  |
Income Taxes [Line Items] |  |  |  |
State and other net operating loss carry forwards expiration date | 2034 |  |  |

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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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