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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 |  |  |  |

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