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Financial Data for Each Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Quarterly Financial Data [Line Items]        
Net revenues [1] $ 231,340 $ 241,255 $ 684,020 $ 728,663
Gross Profit 88,121 94,583 252,003 275,292
Selling, general and administrative expenses 27,160 29,526 86,150 77,468
Income from operations 60,961 65,057 165,853 197,824
Banking and Financial Services        
Quarterly Financial Data [Line Items]        
Net revenues 103,058 116,093 312,690 357,902
Healthcare and Life Sciences        
Quarterly Financial Data [Line Items]        
Net revenues 41,528 39,519 118,704 117,880
Insurance        
Quarterly Financial Data [Line Items]        
Net revenues 35,446 32,960 100,947 95,780
Manufacturing        
Quarterly Financial Data [Line Items]        
Net revenues 9,663 11,006 28,645 34,260
Retail, Logistics and Telecom        
Quarterly Financial Data [Line Items]        
Net revenues 41,645 41,677 123,034 122,841
Operating Segments        
Quarterly Financial Data [Line Items]        
Gross Profit 88,563 95,325 253,415 277,379
Operating Segments | Banking and Financial Services        
Quarterly Financial Data [Line Items]        
Gross Profit 39,453 45,535 116,446 135,832
Operating Segments | Healthcare and Life Sciences        
Quarterly Financial Data [Line Items]        
Gross Profit 17,760 17,047 47,705 47,313
Operating Segments | Insurance        
Quarterly Financial Data [Line Items]        
Gross Profit 11,258 12,418 32,577 34,399
Operating Segments | Manufacturing        
Quarterly Financial Data [Line Items]        
Gross Profit 2,481 3,137 7,368 9,953
Operating Segments | Retail, Logistics and Telecom        
Quarterly Financial Data [Line Items]        
Gross Profit 17,611 17,188 49,319 49,882
Corporate direct costs        
Quarterly Financial Data [Line Items]        
Gross Profit $ (442) $ (742) $ (1,412) $ (2,087)
[1] Net revenues are attributed to regions based upon customer location.