Quarterly report pursuant to Section 13 or 15(d)

Business Acquisitions and Dispositions - Revenues and Other Activities Associated with Dealerships Classified as Discontinued Operations (Detail)

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Business Acquisitions and Dispositions - Revenues and Other Activities Associated with Dealerships Classified as Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Business Combinations [Abstract]    
Income (loss) from operations $ (335)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss $ (588)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss
Gain (loss) on disposal   (45)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
Lease exit accrual adjustments and charges (356)sah_DiscontinuedOperationLeaseExitAccrualAdjustmentsAndCharges (332)sah_DiscontinuedOperationLeaseExitAccrualAdjustmentsAndCharges
Pre-tax income (loss) $ (691)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax $ (965)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax