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Supplemental 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
Statement of Operations Data                      
Net revenues $ 172,387 $ 209,332 $ 217,966 $ 213,839 $ 203,021 $ 186,798 $ 184,697 $ 206,353 $ 813,524 $ 780,869 $ 669,420
Gross profit 72,799 94,229 98,798 97,046 89,434 79,325 79,635 89,372 362,872 337,766 266,574
Income from operations 22,205 41,363 46,034 47,010 38,554 28,150 30,660 37,778 156,612 135,142 58,387
Net income $ 25,522 $ 29,769 $ 33,220 $ 33,786 $ 34,192 $ 29,117 $ 21,224 $ 31,245 $ 122,297 $ 115,778 $ 35,776
Net income per share:                      
Basic $ 0.48 $ 0.56 $ 0.62 $ 0.63 $ 0.64 $ 0.55 $ 0.40 $ 0.58 $ 2.30 $ 2.17 $ 0.67
Diluted 0.48 0.56 0.62 0.63 0.64 0.55 0.40 0.58 2.28 2.16 0.67
Cash dividends paid per common share $ 0.170 $ 0.170 $ 0.170 $ 0.165 $ 0.165 $ 0.165 $ 0.165 $ 0.160 $ 0.675 $ 0.655 $ 0.640