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Segment Reporting (Segment Reporting Information) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
segment
Jun. 30, 2012
Segment Reporting [Abstract]        
Reportable segments (in number of segments)     5  
Revenues:        
Total Revenues $ 417,923 $ 265,863 $ 807,116 $ 422,623
Gross Profit:        
Total Gross Profit 124,567 84,537 237,841 137,286
Operating Income (Loss):        
Total Operating Income 32,838 15,480 56,572 24,850
Apex
        
Revenues:        
Total Revenues 233,446 98,503 446,174 98,503
Gross Profit:        
Total Gross Profit 63,896 26,983 119,515 26,983
Operating Income (Loss):        
Total Operating Income 16,431 (3,648) 26,510 (3,648)
Oxford
        
Revenues:        
Total Revenues 101,474 88,107 196,736 166,866
Gross Profit:        
Total Gross Profit 34,506 31,646 66,656 59,016
Operating Income (Loss):        
Total Operating Income 14,020 15,521 25,436 22,756
Life Sciences
        
Revenues:        
Total Revenues 41,877 40,509 82,350 81,860
Gross Profit:        
Total Gross Profit 13,838 13,808 27,222 27,647
Operating Income (Loss):        
Total Operating Income 1,255 2,963 1,875 5,271
Physician
        
Revenues:        
Total Revenues 26,466 25,039 52,768 49,128
Gross Profit:        
Total Gross Profit 7,640 7,718 15,123 15,217
Operating Income (Loss):        
Total Operating Income 1,927 1,984 4,082 3,062
Healthcare
        
Revenues:        
Total Revenues 14,660 13,705 29,088 26,266
Gross Profit:        
Total Gross Profit 4,687 4,382 9,325 8,423
Operating Income (Loss):        
Total Operating Income $ (795) $ (1,340) $ (1,331) $ (2,591)