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Segment Reporting (Segment Reporting Information) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
segment
Jun. 30, 2015
USD ($)
Revenues:        
Revenues $ 608,088 $ 485,323 $ 1,190,128 $ 915,368
Revenue as Percentage of Consolidated Revenue 100.00% 100.00% 100.00% 100.00%
Gross Profit:        
Total Gross Profit $ 202,086 $ 158,534 $ 389,868 $ 294,409
Operating Income (Loss):        
Total Operating Income 50,704 32,710 88,461 57,781
Amortization of Intangible Assets 10,032 6,957 $ 20,176 11,826
Reportable segments (in number of segments) | segment     2  
Apex        
Revenues:        
Revenues 453,723 340,480 $ 886,878 636,451
Gross Profit:        
Total Gross Profit 138,165 98,274 264,309 178,426
Operating Income (Loss):        
Total Operating Income 50,190 34,265 90,176 57,161
Amortization of Intangible Assets 8,590 5,384 17,180 8,906
Oxford        
Revenues:        
Revenues 154,365 144,843 303,250 278,917
Gross Profit:        
Total Gross Profit 63,921 60,260 125,559 115,983
Operating Income (Loss):        
Total Operating Income 13,856 15,825 26,616 28,538
Amortization of Intangible Assets 1,442 1,573 2,996 2,920
Corporate Segment [Member]        
Operating Income (Loss):        
Total Operating Income (13,342) (17,380) (28,331) (27,918)
Amortization of Intangible Assets 0 0 0 0
Assignment [Member]        
Revenues:        
Revenues $ 574,323 $ 456,592 $ 1,123,875 $ 862,733
Revenue as Percentage of Consolidated Revenue 94.40% 94.10% 94.40% 94.20%
PermanentPlacement [Member]        
Revenues:        
Revenues $ 33,765 $ 28,731 $ 66,253 $ 52,635
Revenue as Percentage of Consolidated Revenue 5.60% 5.90% 5.60% 5.80%