Acquisitions - Summary of Purchase Price Allocation (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Nov. 14, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill	$ 3,546,034	$ 3,713,182		$ 1,535,672
Comdata Inc. [Member]
Business Acquisition [Line Items]
Restricted cash			$ 93,312
Trade and other receivables			638,137
Prepaid expenses and other			15,443
Property and equipment			17,984
Goodwill			2,253,348
Other intangible assets			1,630,700
Notes and other liabilities assumed			(804,032)
Deferred tax liabilities			(423,977)
Other long term liabilities			(6,841)
Aggregate purchase price			$ 3,414,074
All 2013 Acquisitions [Member]
Business Acquisition [Line Items]
Trade and other receivables				71,767
Prepaid expenses and other				12,151
Property and equipment				5,791
Other long term assets				53,737
Goodwill				641,361
Other intangible assets				473,000
Notes and other liabilities assumed				(284,974)
Deferred tax liabilities				(83,470)
Other long term liabilities				(50,092)
Aggregate purchase price				$ 839,271
2015 Acquisitions [Member]
Business Acquisition [Line Items]
Trade and other receivables	462
Prepaid expenses and other	1,093
Property and equipment	203
Goodwill	10,082
Other intangible assets	39,433
Deferred tax liabilities	(2,558)
Liabilities assumed	(3,055)
Aggregate purchase price	$ 45,660
Other Acquisitions [Member]
Business Acquisition [Line Items]
Trade and other receivables		62,604
Prepaid expenses and other		232
Property and equipment		71
Goodwill		30,596
Other intangible assets		47,974
Notes and other liabilities assumed		(66,499)
Aggregate purchase price		$ 74,978