Goodwill and Other Intangible Assets - Schedule of Other Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amounts	$ 3,367,524		$ 3,468,241
Accumulated Amortization	(959,614)		(743,284)
Net Carrying Amount	2,407,910	[1]	2,724,957
Trade names and trademarks—indefinite lived
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amounts	479,555		499,587
Net Carrying Amount	$ 479,555		499,587
Customer and vendor agreements
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted- Avg Useful Life (Years)	17 years 1 month 6 days
Gross Carrying Amounts	$ 2,625,270		2,698,428
Accumulated Amortization	(776,383)		(605,347)
Net Carrying Amount	$ 1,848,887		2,093,081
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	$ 2,957		2,986
Accumulated Amortization	(2,501)		(2,207)
Net Carrying Amount	$ 456		779
Software
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted- Avg Useful Life (Years)	6 years
Gross Carrying Amounts	$ 212,733		219,019
Accumulated Amortization	(152,416)		(116,654)
Net Carrying Amount	$ 60,317		102,365
Non-compete agreements
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted- Avg Useful Life (Years)	4 years 2 months 12 days
Gross Carrying Amounts	$ 47,009		48,221
Accumulated Amortization	(28,314)		(19,076)
Net Carrying Amount	$ 18,695		$ 29,145

[1] Reflects the impact of the Company's adoption of ASC 606 and related cost capitalization guidance, which was adopted by the Company on January 1, 2018 using the modified retrospective transition method. The adoption of ASC 606 resulted in an adjustment to retained earnings in our consolidated balance sheet for the cumulative effect of applying the standard, which included costs incurred to obtain a contract, as well as presentation changes in our statements of income, including the classification of certain amounts previously classified as merchant commissions and processing expense net with revenues. As a result of the application of the modified retrospective transition method, the Company's prior period results within its Form 10-K and quarterly reports on Form 10-Q will not be restated to reflect ASC 606.