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Summary of Significant Accounting Policies - Summary of Operating Lease Exit Accruals (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended |
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Mar. 31, 2015
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| Accounting Policies [Abstract] | |
| Component of lease exit expense in income (loss) from operations and the sale of dealerships | $ 0.4sah_LeaseExitExpenseDiscontinuedOperations |
| Component of lease exit expense in selling, general and administrative expenses | 0.1sah_LeaseExitExpenseSellingGeneralAndAdministrative |
| Component of lease exit payments in selling, general and administrative expenses | 0.2sah_LeaseExitPaymentSellingGeneralAndAdministrative |
| Component of lease exit payments in income (loss) from operations and the sale of dealerships | $ 1.4sah_LeaseExitPaymentDiscontinuedOperations |
| X | ||||||||||
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- Definition
Lease exit expense discontinued operations. No definition available.
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| X | ||||||||||
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- Definition
Lease exit expense selling general and administrative. No definition available.
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| X | ||||||||||
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- Definition
Lease exit payment discontinued operations. No definition available.
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| X | ||||||||||
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- Definition
Lease exit payment selling general and administrative. No definition available.
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| X | ||||||||||
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- Details
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