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Selected Quarterly Financial Data (Unaudited) - Summary of Selected Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 890,272 $ 899,869 $ 899,513 $ 835,941 $ 915,361 $ 913,386 $ 893,930 $ 848,449 $ 3,525,595 $ 3,571,126 $ 3,373,898
Gross margin 116,774 105,064 101,729 89,128 89,910 93,196 98,585 88,744 412,695 370,435 371,023
Operating income 35,341 33,418 29,476 18,795 24,777 7,677 30,927 20,496 117,030 83,877 113,747
Net income $ 22,374 $ 19,832 $ 18,467 $ 10,276 $ 16,356 $ 4,491 $ 18,676 $ 12,035 $ 70,949 $ 51,558 $ 69,110
Basic earnings per share $ 0.63 $ 0.55 $ 0.51 $ 0.28 $ 0.45 $ 0.12 $ 0.51 $ 0.33 $ 1.98 $ 1.41 $ 1.88
Diluted earnings per share $ 0.63 $ 0.55 $ 0.51 $ 0.28 $ 0.45 $ 0.12 $ 0.51 $ 0.33 $ 1.97 $ 1.40 $ 1.87