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Segment Reporting (Segment Reporting Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues:        
Revenues $ 878,509 $ 653,313 $ 1,563,682 $ 1,279,841
Gross Profit:        
Total Gross Profit 263,846 212,937 481,583 411,081
Operating Income (Loss):        
Total Operating Income 65,682 59,461 111,374 103,069
Amortization of Intangible Assets 18,548 8,299 26,149 16,763
Apex        
Revenues:        
Revenues 567,507 502,455 1,106,011 984,970
Gross Profit:        
Total Gross Profit 169,667 150,223 328,315 290,142
Operating Income (Loss):        
Total Operating Income 64,903 56,770 121,167 103,663
Amortization of Intangible Assets 6,546 7,262 13,092 14,789
Oxford        
Revenues:        
Revenues 155,852 150,858 302,521 294,871
Gross Profit:        
Total Gross Profit 65,520 62,714 124,609 120,939
Operating Income (Loss):        
Total Operating Income 14,812 14,774 24,638 23,437
Amortization of Intangible Assets 1,048 1,037 2,103 1,974
ECS        
Revenues:        
Revenues 155,150 0 155,150 0
Gross Profit:        
Total Gross Profit 28,659 0 28,659 0
Operating Income (Loss):        
Total Operating Income 3,698 0 3,698 0
Amortization of Intangible Assets 10,954 0 10,954 0
Corporate        
Operating Income (Loss):        
Total Operating Income [1] (17,731) (12,083) (38,129) (24,031)
Assignment | Apex        
Revenues:        
Revenues 553,672 491,334 1,078,526 962,600
Assignment | Oxford        
Revenues:        
Revenues 130,301 128,680 255,703 251,929
Permanent placement | Apex        
Revenues:        
Revenues 13,835 11,121 27,485 22,370
Permanent placement | Oxford        
Revenues:        
Revenues 25,551 22,178 46,818 42,942
Fixed-price Contract | ECS        
Revenues:        
Revenues 44,762 0 44,762 0
Time-and-materials Contract | ECS        
Revenues:        
Revenues 48,995 0 48,995 0
Cost-plus-fixed-fee Contract | ECS        
Revenues:        
Revenues $ 61,393 $ 0 $ 61,393 $ 0
[1] Corporate expenses primarily consist of consolidated stock-based compensation expense, compensation for corporate employees, acquisition, integration and strategic planning expenses, public company expenses and depreciation expense for corporate assets.