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Business Segments (Segment Reporting Information) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
segment
Dec. 31, 2011
Dec. 31, 2010
Revenues:                      
Revenues $ 380,381,000 $ 374,511,000 $ 265,863,000 $ 156,760,000 $ 148,029,000 $ 147,014,000 $ 132,862,000 $ 119,734,000 $ 1,177,515,000 $ 547,639,000 $ 401,320,000
Gross Profit:                      
Gross profit 115,619,000 115,631,000 84,537,000 52,749,000 50,151,000 50,793,000 46,179,000 40,705,000 368,536,000 187,828,000 139,331,000
Operating Income (Loss):                      
Operating Income                 84,952,000 40,083,000 16,221,000
Reportable segments (in number of segments)                 5    
Apex
                      
Revenues:                      
Revenues                 508,743,000 0 0
Gross Profit:                      
Gross profit                 140,669,000 0 0
Operating Income (Loss):                      
Operating Income                 21,593,000 [1] 0 [1] 0 [1]
Oxford
                      
Revenues:                      
Revenues                 345,380,000 266,742,000 178,688,000
Gross Profit:                      
Gross profit                 122,043,000 94,967,000 64,775,000
Operating Income (Loss):                      
Operating Income                 48,802,000 31,816,000 13,910,000
Life Sciences
                      
Revenues:                      
Revenues                 162,799,000 155,324,000 109,495,000
Gross Profit:                      
Gross profit                 55,874,000 52,643,000 37,776,000
Operating Income (Loss):                      
Operating Income                 11,626,000 10,727,000 5,305,000
Healthcare
                      
Revenues:                      
Revenues                 57,914,000 44,956,000 39,542,000
Gross Profit:                      
Gross profit                 18,495,000 14,360,000 12,933,000
Operating Income (Loss):                      
Operating Income                 (5,452,000) (7,807,000) (8,004,000)
Physician
                      
Revenues:                      
Revenues                 102,679,000 80,617,000 73,595,000
Gross Profit:                      
Gross profit                 31,455,000 25,858,000 23,847,000
Operating Income (Loss):                      
Operating Income                 8,383,000 5,347,000 5,010,000
Apex Systems
                      
Operating Income (Loss):                      
Acquisition costs expensed                 $ 9,800,000    
[1] Apex operating income includes acquisition related costs of $9.8 million for the twelve months ended December 31, 2012.