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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Income Taxes [Line Items] |  |
Net short-term deferred tax asset | 13,200,000 us-gaap_DeferredTaxAssetsNetCurrent | $ 15,900,000 us-gaap_DeferredTaxAssetsNetCurrent
Net long-term deferred tax asset | 3,800,000 us-gaap_DeferredTaxAssetsNetNoncurrent | 3,900,000 us-gaap_DeferredTaxAssetsNetNoncurrent
Net long-term deferred tax liability | 57,601,000 us-gaap_DeferredTaxLiabilitiesNoncurrent | 31,552,000 us-gaap_DeferredTaxLiabilitiesNoncurrent
Gross deferred tax assets related to state net operating loss carryforwards | 280,900,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration |
Valuation allowance related to certain state net operating loss carryforward deferred tax assets | 6,500,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal |
Liabilities recorded related to unrecognized tax benefits |  | 7,800,000 sah_UnrecognizedTaxBenefitsRecordedLiability
Liabilities related to interest and penalties | 1,200,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 1,100,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Unorganized tax benefit that would affect income tax rate if recognized | 2,800,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | $ 3,000,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
State and Local Jurisdiction [Member] |  |
Income Taxes [Line Items] |  |
Operating loss expiration date | Net operating loss carryforwards that will expire between [2015 and 2032] |
Operating loss expiration, beginning year | 2016 |
Operating loss expiration, ending year | 2034 |
Income tax examination range upper limit | 2014 |
Income tax examination range lower limit | 2006 |
United States Federal Income Tax Authority [Member] |  |
Income Taxes [Line Items] |  |
Income tax examination range upper limit | 2014 |
Income tax examination range lower limit | 2011 |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31958-109318 + Details
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