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Goodwill and Other Intangible Assets, Net - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Finite-Lived Intangible Assets [Line Items]        
Amortization expense $ 79.4 $ 59.4 $ 181.0 $ 79.2
Noncompete Agreements [Member]        
Finite-Lived Intangible Assets [Line Items]        
Expense (income) adjustment for amortization $ 2.8   $ 13.6