Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended		12 Months Ended		1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 Foreign Line of Credit New Zealand [Member]	Mar. 25, 2013 GE Capital's Fleet Card [Member] Fuel_Center Center	Jul. 03, 2012 All 2012 Acquisitions [Member]	Dec. 31, 2012 All 2012 Acquisitions [Member]	Jun. 30, 2013 Card Link [Member]	Jun. 30, 2013 Card Link [Member] Foreign Line of Credit New Zealand [Member]
Business Acquisition, Contingent Consideration [Line Items]
Aggregate purchase price	$ 159.6		$ 207.4			$ 156.0
Deferred payment	1.3		11.3				11.3
Contingent earn-out payment	1.4		4.9				4.9
Number of fuel outlets					6,000
Number of automotive service and repair centers					7,000
Customer relationships with regards to fuel cards					33.33%
Acquisition	11			12				11	12
First payment related earn-out			1.3
Cash and cash equivalents acquired in purchase							1.9
Goodwill deductible tax amount	243
Acquisition related costs	$ 3.4	$ 1.0