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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) Option | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Contingencies And Commitments [Line Items] |  |  |
Lease exit expense | $ 1.4 |  |
Interest Expense | 1.0 |  |
Lease exit accrued cost | $ 0.4 |  |
Operating lease term for dealership facilities, minimum | 15 years |  |
Operating lease term for dealership facilities, maximum | 20 years |  |
Operating lease number of renewal options, minimum | Option | 1 |  |
Operating lease number of renewal options, maximum | Option | 2 |  |
Operating lease period of renewal options, minimum | 5 years |  |
Operating lease period of renewal options, maximum | 10 years |  |
Percentage of lease facility based on capitalization rates | 10.00% |  |
Lease expense for continuing operation | $ 94.6 | $ 98.2 | $ 106.0
Lease income (expense) for discontinuing operation | (0.9) | (1.4) | 0.9
Benefit related to lease exit accrual adjustment for extension of sublease |  |  | 1.4
Leases, net contingent rent benefit related to decrease in interest rates from continuing operation | 1.8 | 2.0 | 2.0
Leases net contingent rent benefit related to decrease in interest rates from discontinuing operation | 0.1 | 0.1 | $ 0.1
Obligations under subleases, if subleases do not perform | 54.1 |  |
Estimated minimum lease payment | 1.0 |  |
Maximum exposure associated with general indemnifications | $ 0.5 |  |
General indemnifications minimum expiration period | 1 year |  |
General indemnifications maximum expiration period | 3 years |  |
Contingent liability reserve balance after reduction | $ 2.8 |  |
Other Accrued Liabilities [Member] |  |  |
Contingencies And Commitments [Line Items] |  |  |
Amount reserved for pending proceedings | 0.3 | 0.3 |
Other Long-Term Liabilities [Member] |  |  |
Contingencies And Commitments [Line Items] |  |  |
Amount reserved for pending proceedings | $ 0.2 | $ 0.2 |
Dealership [Member] |  |  |
Contingencies And Commitments [Line Items] |  |  |
Joint venture ownership percentage | 50.00% |  |

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