Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Operating Lease Exit Accruals (Detail)

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Summary of Significant Accounting Policies - Summary of Operating Lease Exit Accruals (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Accounting Policies [Abstract]  
Balance, December 31, 2014 $ 18,962sah_LeaseExitAccruals
Lease exit expense 503sah_LeaseExitExpense
Payments (1,562)sah_LeaseExitPayment
Balance, March 31, 2015 $ 17,903sah_LeaseExitAccruals