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Unaudited Quarterly Financial Results (Details) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                        
Revenues   $ 423,598,000 $ 421,491,000 $ 407,864,000 $ 379,044,000 $ 369,441,000 $ 363,882,000 $ 256,386,000 $ 148,277,000 $ 1,631,997,000 $ 1,137,986,000 $ 515,584,000
Gross profit   129,753,000 127,210,000 121,332,000 110,111,000 112,054,000 112,213,000 81,509,000 50,117,000 488,406,000 355,893,000 177,688,000
Income from continuing operations   17,425,000 19,471,000 7,243,000 10,216,000 12,004,000 14,078,000 5,586,000 4,791,000 54,355,000 36,459,000 20,864,000
Income from discontinued operations, net of income taxes   14,985,000 679,000 96,000 14,397,000 2,201,000 1,425,000 1,976,000 592,000 (683,000) 6,194,000 3,433,000
Net income   32,410,000 20,150,000 7,339,000 24,613,000 14,205,000 15,503,000 7,562,000 5,383,000 84,512,000 42,653,000 24,297,000
Earnings Per Share, Basic [Abstract]                        
Income from continuing operations   $ 0.32 $ 0.36 $ 0.14 $ 0.19 $ 0.23 $ 0.27 $ 0.12 $ 0.13 $ 1.02 $ 0.78 $ 0.57
Income from discontinued operations   $ 0.28 $ 0.02 $ 0.00 $ 0.27 $ 0.04 $ 0.03 $ 0.05 $ 0.01 $ 0.56 $ 0.13 $ 0.09
Net income   $ 0.60 $ 0.38 $ 0.14 $ 0.46 $ 0.27 $ 0.30 $ 0.17 $ 0.14 $ 1.58 $ 0.91 $ 0.66
Earnings Per Share, Diluted [Abstract]                        
Income from continuing operations   $ 0.32 $ 0.36 $ 0.13 $ 0.19 $ 0.22 $ 0.26 $ 0.12 $ 0.13 $ 1.00 $ 0.76 $ 0.55
Income from discontinued operations   $ 0.27 $ 0.01 $ 0.01 $ 0.27 $ 0.04 $ 0.03 $ 0.04 $ 0.01 $ 0.55 $ 0.13 $ 0.09
Net income   $ 0.59 $ 0.37 $ 0.14 $ 0.46 $ 0.26 $ 0.29 $ 0.16 $ 0.14 $ 1.55 $ 0.89 $ 0.64
Segment Reporting Information                        
Classification error related to vendor fees 16,400,000                      
Apex Segment [Member]
                        
Quarterly Financial Information Disclosure [Abstract]                        
Revenues                   942,463,000 508,743,000  
Gross profit                   258,150,000 140,669,000  
Segment Reporting Information                        
Restatement of Prior Year Income, Gross           (5,000,000) 3,400,000 1,600,000        
Restatement of Prior Year Income, Net of Tax           (2,900,000) 1,900,000 1,000,000        
Vendor Fees [Member] | Apex Systems
                        
Segment Reporting Information                        
Classification error related to vendor fees               $ 500,000