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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges and other |  |  |  |  | $ (600) |  |  | $ 1,300 |  | $ 9,800 |  | $ 0 | $ 10,480 | $ 3,687
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 729,069 | $ 702,538 | $ 707,332 | $ 802,408 | 650,011 |  | $ 626,286 | 627,838 |  | 699,479 |  | 2,941,347 | 2,603,614 | 2,357,788
Gross profit | 110,539 | 117,796 | 113,259 | 150,016 | 97,045 |  | 106,743 | 104,219 |  | 129,860 |  | 491,610 | 437,867 | 403,805
Operating income | 14,467 | 22,773 | 16,023 | 53,043 | 10,026 | [1] | 19,936 | 12,217 | [2] | 23,520 | [3] | 106,306 | 65,699 | 47,474
Net income | $ 9,520 | $ 14,065 | $ 9,713 | $ 32,693 | $ 6,339 |  | $ 11,950 | $ 7,314 |  | $ 13,787 |  | $ 65,991 | $ 39,390 | $ 28,004
Basic net income per share of common stock (in dollars per share) | $ 0.45 | $ 0.66 | $ 0.45 | $ 1.53 | $ 0.26 |  | $ 0.48 | $ 0.29 |  | $ 0.54 |  | $ 3.10 | $ 1.58 | $ 1.05
Diluted net income per share (in dollars per share) | $ 0.45 | $ 0.66 | $ 0.45 | $ 1.53 | $ 0.26 |  | $ 0.48 | $ 0.29 |  | $ 0.54 |  | $ 3.09 | $ 1.58 | $ 1.05
Goodwill and Intangible Asset Impairment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,500
Asset impairment charge due to change in office consolidation plans |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200
[1] | Includes a reduction to non-cash impairment and other charges in the fourth quarter of 2015 of $0.6 million. Please read Note 7, “Impairment Charges and Other,” for additional information.
[2] | Includes non-cash impairment and other charges in the second quarter of 2015 of $1.3 million. Please read Note 7, “Impairment Charges and Other,” for additional information.
[3] | Includes non-cash impairment and other charges in the first quarter of 2015 of $9.8 million. Please read Note 7, “Impairment Charges and Other,” for additional information.

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