Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Operating Lease Exit Accruals (Parenthetical) (Detail)

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Summary of Significant Accounting Policies - Summary of Operating Lease Exit Accruals (Parenthetical) (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2015
USD ($)
Accounting Policies [Abstract]  
Components of lease exit expense in interest expense, other, net $ 0.1
Component of lease exit expense in income (loss) from operations and the sale of dealerships before tax 0.6
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 $ 2.7