Inventories and Related Notes Payable - Floor Plan - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
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| Inventory Disclosure [Abstract] | |||
| Average interest rate for new vehicle floor plan facilities, for continuing operations and discontinued operations | 1.61% | 1.57% | 1.86% |
| Amount recognized as reduction in cost of sales for continuing and discontinued operations | $ 42.1 | $ 39.7 | $ 37.9 |
| Average interest rate for used vehicle floor plan facilities, for continuing operations and discontinued operations | 1.72% | 1.80% | 2.78% |
| X | ||||||||||
- Definition Floor plan assistance recognized. No definition available.
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| X | ||||||||||
- Definition Weighted average interest rate new vehicle floor plan. No definition available.
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| X | ||||||||||
- Definition Weighted average interest rate used vehicle floor plan. No definition available.
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| X | ||||||||||
- References No definition available.
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