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Significant Components of Current and Long-Term Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Components Of Deferred Income Tax Assets And Liabilities [Line Items]    
Capitalized inventory costs and inventory reserves $ 3,262us-gaap_DeferredTaxAssetsInventory $ 2,883us-gaap_DeferredTaxAssetsInventory
Self-insurance reserves 759us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance 1,093us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance
Allowance for doubtful accounts 992us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 882us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Other current deferred tax assets 1,588us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther 1,539us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
Total current deferred tax assets 6,601us-gaap_DeferredTaxAssetsGrossCurrent [1] 6,397us-gaap_DeferredTaxAssetsGrossCurrent [1]
Share-based compensation 20,108us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 17,455us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Other long-term deferred tax assets 746us-gaap_DeferredTaxAssetsOther 909us-gaap_DeferredTaxAssetsOther
Net operating loss carryforwards 221us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 283us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Total long-term deferred tax assets 21,075us-gaap_DeferredTaxAssetsGrossNoncurrent 18,647us-gaap_DeferredTaxAssetsGrossNoncurrent
Valuation allowance   (75)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Total long-term deferred tax assets 21,075us-gaap_DeferredTaxAssetsNetNoncurrent [2] 18,572us-gaap_DeferredTaxAssetsNetNoncurrent [2]
Other current deferred tax liabilities (536)wso_DeferredTaxLiabilitiesOtherCurrent (1,304)wso_DeferredTaxLiabilitiesOtherCurrent
Total current deferred tax liabilities (536)us-gaap_DeferredTaxLiabilitiesCurrent [1] (1,304)us-gaap_DeferredTaxLiabilitiesCurrent [1]
Deductible goodwill (80,404)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill (76,519)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill
Depreciation (2,992)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (2,873)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Other long-term deferred tax liabilities (1,320)us-gaap_DeferredTaxLiabilitiesOther (2,556)us-gaap_DeferredTaxLiabilitiesOther
Total long-term deferred tax liabilities (84,716)us-gaap_DeferredTaxLiabilities [2] (81,948)us-gaap_DeferredTaxLiabilities [2]
Net deferred tax liabilities $ (57,576)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (58,283)us-gaap_DeferredTaxAssetsLiabilitiesNet
[1] Current deferred tax assets and liabilities have been included in the consolidated balance sheets in other current assets.
[2] Long-term deferred tax assets and liabilities have been included in the consolidated balance sheets in deferred income taxes and other liabilities.