Summary of Significant Accounting Policies - Summary of Lease Exit Accruals (Parenthetical) (Detail) $ in Millions |
6 Months Ended |
|---|---|
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Jun. 30, 2017
USD ($)
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| Accounting Policies [Abstract] | |
| Component of lease exit expense in selling, general and administrative expenses | $ 1.1 |
| Component of lease exit expense in income (loss) from operations and the sale of dealerships before tax | 0.7 |
| Component of lease exit payments in selling, general and administrative expenses | 0.4 |
| Component of lease exit payments in income (loss) from operations and the sale of dealerships before tax | $ 1.5 |
| X | ||||||||||
- Definition Lease exit expense selling general and administrative. 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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