Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Summary of Lease Exit Accruals (Detail)

v2.4.1.9
Commitments and Contingencies - Summary of Lease Exit Accruals (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]  
Beginning balance $ 27,234sah_LeaseExitAccruals
Lease exit expense 302sah_LeaseExitExpense
Payments (7,018)sah_LeaseExitPayment
Lease buyout (1,556)sah_LeaseBuyout
Ending balance $ 18,962sah_LeaseExitAccruals