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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Commitments and Contingencies Disclosure [Line Items]      
Self-insurance reserves $ 2,951 $ 3,214  
Maximum exposure to loss related to involvement with variable interest entity $ 4,300    
Operating leases maximum maturity date 2025    
Rental expense $ 83,260 $ 82,581 $ 81,155
Carrier and Its Affiliates      
Commitments and Contingencies Disclosure [Line Items]      
Non-cancelable purchase obligations for goods 29,000    
Key Suppliers      
Commitments and Contingencies Disclosure [Line Items]      
Non-cancelable purchase obligations for goods $ 17,000