Financial Data for Each Segment (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Quarterly Financial Data [Line Items]
Net revenues	[1]	$ 253,636	$ 228,332	$ 714,032	$ 676,105
Corporate Direct cost		(1,205)	(1,205)	(3,910)	(3,955)
Gross Profit		107,575	94,528	277,482	280,099
Selling, general and administrative expenses		15,121	26,566	72,231	85,108
Income from operations		92,454	67,962	205,251	194,991
Banking and Financial Services
Quarterly Financial Data [Line Items]
Net revenues		125,779	115,454	346,952	336,495
Healthcare and Life Sciences
Quarterly Financial Data [Line Items]
Net revenues		42,595	35,834	116,341	113,091
Insurance
Quarterly Financial Data [Line Items]
Net revenues		32,692	35,002	102,058	101,219
Manufacturing
Quarterly Financial Data [Line Items]
Net revenues		11,239	6,989	29,760	19,890
Retail, Logistics & Telecom
Quarterly Financial Data [Line Items]
Net revenues		41,331	35,053	118,921	105,410
Operating Segments
Quarterly Financial Data [Line Items]
Gross Profit		108,780	95,733	281,392	284,054
Operating Segments | Banking and Financial Services
Quarterly Financial Data [Line Items]
Gross Profit		52,177	48,509	134,933	141,810
Operating Segments | Healthcare and Life Sciences
Quarterly Financial Data [Line Items]
Gross Profit		20,312	16,405	49,573	52,935
Operating Segments | Insurance
Quarterly Financial Data [Line Items]
Gross Profit		13,151	13,088	37,150	37,252
Operating Segments | Manufacturing
Quarterly Financial Data [Line Items]
Gross Profit		3,979	2,232	9,250	5,991
Operating Segments | Retail, Logistics & Telecom
Quarterly Financial Data [Line Items]
Gross Profit		$ 19,161	$ 15,499	$ 50,486	$ 46,066

[1] Net revenues are attributed to regions based upon customer location.