Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				1 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Jul. 03, 2012 All 2012 Acquisitions [Member]	Mar. 25, 2013 GE Capital's Fleet Card [Member] Fuel_Center Center	Dec. 31, 2012 All 2012 Acquisitions [Member]
Business Acquisition, Contingent Consideration [Line Items]
Aggregate purchase price	$ 94.8		$ 207.4	$ 156.0
Number of fuel outlets					6,000
Number of automotive service and repair centers					7,000
Customer relationships with regards to fuel cards					33.33%
Deferred payment	11.3		11.3			11.3
Contingent earn-out payment	3.8		5.2			5.2
Cash and cash equivalents acquired in purchase						1.9
Goodwill deductible tax amount	238
Acquisition related costs	$ 1.7	$ 0.1