Acquisitions - Purchase Price Allocations of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
All 2013 Acquisitions [Member]
Business Acquisition [Line Items]
Intangible assets	473,000
All 2013 Acquisitions [Member] | Trade Names And Trademarks Indefinite Lived [Member]
Business Acquisition [Line Items]
Intangible assets	46,900
All 2012 Acquisitions [Member]
Business Acquisition [Line Items]
Intangible assets		109,782
All 2012 Acquisitions [Member] | Trade Names And Trademarks Indefinite Lived [Member]
Business Acquisition [Line Items]
Intangible assets		16,900
Comdata Inc. [Member]
Business Acquisition [Line Items]
Intangible assets			1,630,700
Comdata Inc. [Member] | Trade Names And Trademarks Indefinite Lived [Member]
Business Acquisition [Line Items]
Intangible assets			237,100
Other Acquisitions [Member]
Business Acquisition [Line Items]
Intangible assets			48,343
Other Acquisitions [Member] | Trade Names And Trademarks Indefinite Lived [Member]
Business Acquisition [Line Items]
Intangible assets			2,900
Customer Relationships [Member] | All 2013 Acquisitions [Member]
Business Acquisition [Line Items]
Intangible assets	357,260
Customer Relationships [Member] | All 2013 Acquisitions [Member] | Minimum [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)	3 years
Customer Relationships [Member] | All 2013 Acquisitions [Member] | Maximum [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)	20 years
Customer Relationships [Member] | All 2012 Acquisitions [Member]
Business Acquisition [Line Items]
Intangible assets		77,678
Customer Relationships [Member] | All 2012 Acquisitions [Member] | Minimum [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)		10 years
Customer Relationships [Member] | All 2012 Acquisitions [Member] | Maximum [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)		20 years
Customer Relationships [Member] | Comdata Inc. [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)			20 years
Intangible assets			1,269,700
Customer Relationships [Member] | Other Acquisitions [Member]
Business Acquisition [Line Items]
Intangible assets			15,943
Customer Relationships [Member] | Other Acquisitions [Member] | Minimum [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)			14 years
Customer Relationships [Member] | Other Acquisitions [Member] | Maximum [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)			20 years
Trade Names and Trademarks [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)			15 years
Trade Names and Trademarks [Member] | All 2013 Acquisitions [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)	15 years
Intangible assets	200
Merchant Network [Member] | All 2013 Acquisitions [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)	10 years
Intangible assets	16,750
Merchant Network [Member] | All 2012 Acquisitions [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)		10 years
Intangible assets		4,604
Software [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)			5 years
Software [Member] | All 2013 Acquisitions [Member]
Business Acquisition [Line Items]
Intangible assets	36,890
Software [Member] | All 2013 Acquisitions [Member] | Minimum [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)	3 years
Software [Member] | All 2013 Acquisitions [Member] | Maximum [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)	10 years
Software [Member] | All 2012 Acquisitions [Member]
Business Acquisition [Line Items]
Intangible assets		9,800
Software [Member] | All 2012 Acquisitions [Member] | Minimum [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)		3 years
Software [Member] | All 2012 Acquisitions [Member] | Maximum [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)		10 years
Software [Member] | Comdata Inc. [Member]
Business Acquisition [Line Items]
Intangible assets			123,300
Software [Member] | Comdata Inc. [Member] | Minimum [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)			4 years
Software [Member] | Comdata Inc. [Member] | Maximum [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)			7 years
Non-compete [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)			5 years 7 months 6 days
Non-compete [Member] | All 2013 Acquisitions [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)	5 years
Intangible assets	15,000
Non-compete [Member] | All 2012 Acquisitions [Member]
Business Acquisition [Line Items]
Intangible assets		800
Non-compete [Member] | All 2012 Acquisitions [Member] | Minimum [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)		2 years
Non-compete [Member] | All 2012 Acquisitions [Member] | Maximum [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)		6 years
Non-compete [Member] | Comdata Inc. [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)			3 years
Intangible assets			600
Franchisee Agreement [Member] | Other Acquisitions [Member]
Business Acquisition [Line Items]
Useful Lives (in Years)			20 years
Intangible assets			$ 29,500