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Supplemental Financial Data (Detail) - 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
Statement of Operations Data                      
Net revenues $ 405,140 $ 380,660 $ 325,861 $ 183,681 $ 172,387 $ 209,332 $ 217,966 $ 213,839 $ 1,295,342 $ 813,524 $ 780,869
Gross profit 183,408 168,385 135,913 77,913 72,799 94,229 98,798 97,046 565,619 362,872 337,766
Income from operations 62,514 53,008 19,186 22,559 22,205 41,363 46,034 47,010 157,267 156,612 135,142
Net income $ 45,487 $ 32,549 $ 9,210 $ 17,563 $ 25,522 $ 29,769 $ 33,220 $ 33,786 $ 104,809 $ 122,297 $ 115,778
Net income per share:                      
Basic $ 0.85 $ 0.61 $ 0.17 $ 0.33 $ 0.48 $ 0.56 $ 0.62 $ 0.63 $ 1.96 $ 2.30 $ 2.17
Diluted 0.83 0.60 0.17 0.33 0.48 0.56 0.62 0.63 1.94 2.28 2.16
Cash dividends paid per common share $ 0.17 $ 0.170 $ 0.170 $ 0.170 $ 0.170 $ 0.170 $ 0.170 $ 0.165 $ 0.680 $ 0.675 $ 0.655