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Acquisitions - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Nov. 10, 2016
Sep. 30, 2017
Sep. 30, 2016
Business Acquisition [Line Items]      
Total consideration for acquisition, less cash acquired   $ (1,645) $ 54,830
TAP      
Business Acquisition [Line Items]      
Total consideration for acquisition, less cash acquired $ 668,348    
Weighted Average Useful Life 8 years 10 months 24 days    
TAP | Dealer/customer related | Minimum      
Business Acquisition [Line Items]      
Weighted Average Useful Life 5 years    
TAP | Dealer/customer related | Maximum      
Business Acquisition [Line Items]      
Weighted Average Useful Life 10 years