Goodwill and Other Intangibles - Schedule of Goodwill and Other Intangibles, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other Intangible Assets [Line Items]
Goodwill	$ 3,967,344	$ 3,908,484
Total Other intangibles—net	373,717	386,881
Brand Names and Trademarks [Member]
Other Intangible Assets [Line Items]
Brand names and trademarks—not amortizing	252,800	252,800
Customer Relationships [Member]
Other Intangible Assets [Line Items]
Gross carrying amount	165,199	1,393,799
Accumulated amortization	(47,300)	(1,260,011)
Net carrying value	117,899	133,788
Noncompete Agreements [Member]
Other Intangible Assets [Line Items]
Gross carrying amount	3,950	800
Accumulated amortization	(932)	(507)
Net carrying value	$ 3,018	$ 293