Goodwill and Other Intangible Assets - Schedule of Other Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amounts	$ 3,468,241	$ 3,209,609
Accumulated Amortization	(743,284)	(556,376)
Net Carrying Amount	2,724,957	2,653,233
Trade names and trademarks—indefinite lived
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amounts	499,587	510,952
Net Carrying Amount	$ 499,587	510,952
Customer and vendor agreements
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted- Avg Useful Life (Years)	17 years
Gross Carrying Amounts	$ 2,698,428	2,449,389
Accumulated Amortization	(605,347)	(458,118)
Net Carrying Amount	$ 2,093,081	1,991,271
Trade names and trademarks—other
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted- Avg Useful Life (Years)	13 years 9 months 18 days
Gross Carrying Amounts	$ 2,986	2,746
Accumulated Amortization	(2,207)	(2,021)
Net Carrying Amount	$ 779	725
Software
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted- Avg Useful Life (Years)	6 years
Gross Carrying Amounts	$ 219,019	211,331
Accumulated Amortization	(116,654)	(85,167)
Net Carrying Amount	$ 102,365	126,164
Non-compete agreements
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted- Avg Useful Life (Years)	4 years 6 months
Gross Carrying Amounts	$ 48,221	35,191
Accumulated Amortization	(19,076)	(11,070)
Net Carrying Amount	$ 29,145	$ 24,121