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Selected Quarterly Financial Data (Unaudited) - Summary of Selected Quarterly Financial Data (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
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]                      
Revenue $ 885,252 $ 882,981 $ 836,685 $ 768,980 $ 801,023 $ 804,888 $ 778,312 $ 739,885 $ 3,373,898 $ 3,124,108 $ 2,751,534
Gross margin 95,088 93,124 95,473 87,338 93,379 91,587 87,358 83,742 371,023 356,066 312,548
Operating income 27,251 31,295 30,464 24,737 31,648 30,351 27,850 22,511 113,747 112,360 94,459
Net income $ 16,536 $ 18,600 $ 18,610 $ 15,364 $ 18,844 $ 18,495 $ 16,952 $ 13,662 $ 69,110 $ 67,953 $ 58,178
Basic earnings per share $ 0.45 $ 0.50 $ 0.50 $ 0.42 $ 0.51 $ 0.50 $ 0.46 $ 0.37 $ 1.88 $ 1.83 $ 1.58
Diluted earnings per share $ 0.45 $ 0.50 $ 0.50 $ 0.42 $ 0.51 $ 0.50 $ 0.46 $ 0.37 $ 1.87 $ 1.83 $ 1.57