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v2.4.1.9

Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deferred tax assets: |  |
Accruals and reserves | $ 36,633 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | $ 38,931 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
State net operating loss carryforwards | 10,307 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 10,194 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Fair value of interest rate swaps | 4,203 us-gaap_DeferredTaxAssetsDerivativeInstruments | 6,185 us-gaap_DeferredTaxAssetsDerivativeInstruments
Interest and state taxes associated with the liability for uncertain income tax positions | 1,842 sah_DeferredTaxAssetsInterestAndStateTaxes | 1,910 sah_DeferredTaxAssetsInterestAndStateTaxes
Other | 792 us-gaap_DeferredTaxAssetsOther | 701 us-gaap_DeferredTaxAssetsOther
Total deferred tax assets | 53,777 us-gaap_DeferredTaxAssetsNet | 57,921 us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities: |  |
Basis difference in inventory | (1,597)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts | (1,636)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts
Basis difference in property and equipment | (9,655)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (1,978)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Basis difference in goodwill | (72,696)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill | (57,028)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill
Other | (3,861)us-gaap_DeferredTaxLiabilitiesOther | (2,328)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liability | (87,809)us-gaap_DeferredTaxLiabilities | (62,970)us-gaap_DeferredTaxLiabilities
Valuation allowance | (6,534)us-gaap_DeferredTaxAssetsValuationAllowance | (6,758)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax asset (liability) | $ (40,566)us-gaap_DeferredTaxAssetsLiabilitiesNet | $ (11,807)us-gaap_DeferredTaxAssetsLiabilitiesNet

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