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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.