Summary of Significant Accounting Policies - Summary of Lease Exit Accruals (Parenthetical) (Detail) $ in Millions |
9 Months Ended |
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Sep. 30, 2016
USD ($)
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| Accounting Policies [Abstract] | |
| Component of lease exit expense in income (loss) from operations and the sale of dealerships before tax | $ 1.0 |
| Component of lease exit expense in interest expense, other, net | 0.1 |
| Component of lease exit payments in selling, general and administrative expenses | 0.5 |
| Component of lease exit payments in income (loss) from operations and the sale of dealerships before tax | $ 4.2 |
| X | ||||||||||
- Definition Lease exit expense interest. No definition available.
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| X | ||||||||||
- Definition Lease exit income (expense) discontinued operations. No definition available.
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| X | ||||||||||
- Definition Lease exit payment discontinued operations. No definition available.
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| X | ||||||||||
- Definition Lease exit payment selling general and administrative. No definition available.
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| X | ||||||||||
- References No definition available.
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