Operating Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenues before reimbursable items	$ 417,512	$ 398,692	$ 821,749	$ 793,870
Revenue for reportable segment	478,443	462,651	943,439	923,813
Depreciation and amortization	40,546	43,213	83,043	84,086
Operating income	95,314	92,096	170,217	176,927
Total assets	3,188,177		3,188,177		2,023,838
North America Services
Segment Reporting Information [Line Items]
Revenue for reportable segment	480,200	470,000	244,900	234,700
International Services
Segment Reporting Information [Line Items]
Revenue for reportable segment	192,700	202,100	96,500	102,500
Merchant Services
Segment Reporting Information [Line Items]
Revenue for reportable segment	270,500	251,700	137,000	125,500
Operating Segments | North America Services
Segment Reporting Information [Line Items]
Revenues before reimbursable items	214,526	205,565	420,122	409,614
Revenue for reportable segment	248,640	239,557	488,429	480,156
Depreciation and amortization	18,213	18,821	36,296	37,274
Operating income	79,896	72,231	147,099	140,578
Total assets	2,935,826		2,935,826		1,744,877
Operating Segments | International Services
Segment Reporting Information [Line Items]
Revenues before reimbursable items	93,209	99,047	185,802	195,538
Revenue for reportable segment	98,087	103,415	195,183	203,775
Depreciation and amortization	11,492	15,006	24,343	27,917
Operating income	8,056	9,438	14,682	13,552
Total assets	388,144		388,144		445,642
Operating Segments | Merchant Services
Segment Reporting Information [Line Items]
Revenues before reimbursable items	112,952	97,701	222,253	196,056
Revenue for reportable segment	136,458	124,903	269,359	250,420
Depreciation and amortization	10,362	8,668	21,515	17,453
Operating income	33,590	32,950	62,917	67,169
Total assets	696,189		696,189		703,725
Operating Segments | Corporate Administration
Segment Reporting Information [Line Items]
Depreciation and amortization	479	718	889	1,442
Operating income	(26,228)	(22,523)	(54,481)	(44,372)
Intersegment Elimination
Segment Reporting Information [Line Items]
Revenues before reimbursable items	(3,175)	(3,621)	(6,428)	(7,338)
Revenue for reportable segment	(4,742)	(5,224)	(9,532)	(10,538)
Total assets	$ (831,982)		$ (831,982)		$ (870,406)