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Commitments and Contingencies (Leases) - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Leases [Abstract]      
Rent expense related to operating leases $ 242.3 $ 208.5 $ 161.5
Maximum guaranteed residual value $ 556.5