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Segment Reporting (Segment Reporting Information) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
segment
Mar. 31, 2012
Segment Reporting [Abstract]    
Reportable segments (in number of segments) 5  
Revenues:    
Total Revenues $ 389,193 $ 156,760
Gross Profit:    
Total Gross Profit 113,274 52,749
Operating Income (Loss):    
Total Operating Income 23,734 9,370
Apex
    
Revenues:    
Total Revenues 212,728 0
Gross Profit:    
Total Gross Profit 55,619 0
Operating Income (Loss):    
Total Operating Income 10,079 0
Oxford
    
Revenues:    
Total Revenues 95,262 78,759
Gross Profit:    
Total Gross Profit 32,150 27,370
Operating Income (Loss):    
Total Operating Income 11,405 7,235
Life Sciences
    
Revenues:    
Total Revenues 40,473 41,351
Gross Profit:    
Total Gross Profit 13,384 13,839
Operating Income (Loss):    
Total Operating Income 692 2,308
Healthcare
    
Revenues:    
Total Revenues 14,428 12,561
Gross Profit:    
Total Gross Profit 4,638 4,041
Operating Income (Loss):    
Total Operating Income (596) (1,251)
Physician
    
Revenues:    
Total Revenues 26,302 24,089
Gross Profit:    
Total Gross Profit 7,483 7,499
Operating Income (Loss):    
Total Operating Income $ 2,154 $ 1,078