Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

v3.6.0.2
Commitments and Contingencies - Additional Information (Detail)
$ in Millions
 12 Months Ended
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%