Reportable Segment Results (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Disclosure [Line Items]
Total Revenues	$ 222,134	$ 191,525	$ 605,783	$ 535,180
Adjusted Pre-Tax Income before NCI	78,427	82,472	226,946	212,912
Operating Segments
Segment Reporting Disclosure [Line Items]
Total Revenues	222,134	191,525	605,783	535,180
Operating Interest Expense	1,860	976	4,747	3,205
Depreciation and Amortization	7,802	6,109	21,379	18,704
Adjusted Pre-Tax Income before NCI			226,946	212,912
Operating Segments | Fleet payment solutions
Segment Reporting Disclosure [Line Items]
Total Revenues	144,497	136,874	425,760	393,953
Operating Interest Expense	1,033	427	2,143	1,392
Depreciation and Amortization	6,412	5,767	19,225	17,358
Adjusted Pre-Tax Income before NCI	48,728	59,117	155,335	164,832
Operating Segments | Other payment solutions
Segment Reporting Disclosure [Line Items]
Total Revenues	77,637	54,651	180,023	141,227
Operating Interest Expense	827	549	2,604	1,813
Depreciation and Amortization	1,390	342	2,154	1,346
Adjusted Pre-Tax Income before NCI	$ 29,699	$ 23,355	$ 71,611	$ 48,080