Goodwill and Other Intangible Assets - Schedule of Other Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amounts	$ 3,266,074	$ 2,578,337
Accumulated Amortization	(507,197)	(394,742)
Net Carrying Amount	2,758,877	2,183,595
Trade names and trademarks—indefinite lived
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amounts	320,408	318,048
Accumulated Amortization	0	0
Net Carrying Amount	$ 320,408	318,048
Customer and vendor agreements
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted- Avg Useful Lives	15 years 9 months 18 days
Gross Carrying Amounts	$ 2,760,942	2,071,928
Accumulated Amortization	(418,166)	(329,664)
Net Carrying Amount	$ 2,342,776	1,742,264
Trade names and trademarks—other
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted- Avg Useful Lives	14 years 4 months 24 days
Gross Carrying Amounts	$ 2,825	3,067
Accumulated Amortization	(1,986)	(2,058)
Net Carrying Amount	$ 839	1,009
Software
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted- Avg Useful Lives	5 years 1 month 6 days
Gross Carrying Amounts	$ 167,573	170,085
Accumulated Amortization	(76,851)	(54,250)
Net Carrying Amount	$ 90,722	115,835
Non-compete agreements
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted- Avg Useful Lives	4 years 9 months 18 days
Gross Carrying Amounts	$ 14,326	15,209
Accumulated Amortization	(10,194)	(8,770)
Net Carrying Amount	$ 4,132	$ 6,439