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Reportable Segments - Operations of Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting Information [Line Items]        
Net service revenues $ 341,575 $ 313,810 $ 991,539 $ 898,592
Gross profit 109,821 98,291 310,599 276,203
Operating expenses 87,209 84,950 259,023 242,634
Income from continuing operations, before income taxes 22,612 13,341 51,576 33,569
Flexible Billings        
Segment Reporting Information [Line Items]        
Net service revenues 327,439 301,310 950,881 863,812
Direct Hire Fees        
Segment Reporting Information [Line Items]        
Net service revenues 14,136 12,500 40,658 34,780
Operating Segments | Technology        
Segment Reporting Information [Line Items]        
Net service revenues 232,113 217,643 677,916 625,315
Gross profit 69,128 63,591 197,982 180,210
Operating Segments | Technology | Flexible Billings        
Segment Reporting Information [Line Items]        
Net service revenues 226,381 212,269 660,692 610,897
Operating Segments | Technology | Direct Hire Fees        
Segment Reporting Information [Line Items]        
Net service revenues 5,732 5,374 17,224 14,418
Operating Segments | Finance and Accounting        
Segment Reporting Information [Line Items]        
Net service revenues 85,111 71,380 239,108 201,773
Gross profit 31,710 26,425 87,229 73,793
Operating Segments | Finance and Accounting | Flexible Billings        
Segment Reporting Information [Line Items]        
Net service revenues 76,707 64,254 215,674 181,411
Operating Segments | Finance and Accounting | Direct Hire Fees        
Segment Reporting Information [Line Items]        
Net service revenues 8,404 7,126 23,434 20,362
Operating Segments | Government Solutions        
Segment Reporting Information [Line Items]        
Net service revenues 24,351 24,787 74,515 71,504
Gross profit 8,983 8,275 25,388 22,200
Operating Segments | Government Solutions | Flexible Billings        
Segment Reporting Information [Line Items]        
Net service revenues 24,351 24,787 74,515 71,504
Operating Segments | Government Solutions | Direct Hire Fees        
Segment Reporting Information [Line Items]        
Net service revenues $ 0 $ 0 $ 0 $ 0