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Summary of the Unaudited Quarterly Results of Operations (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, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Quarterly Financial Information [Line Items]                              
Net sales $ 462,057 $ 464,272 $ 471,439 $ 447,676 $ 543,711 $ 531,350 $ 514,831 $ 437,597 $ 527,477 $ 491,697 $ 486,021 $ 358,120 $ 1,845,444 $ 2,027,489 $ 1,863,315
Gross profit 71,485 83,459 91,064 79,526 87,819 86,022 72,405 57,197 62,721 61,628 61,613 46,672 325,534 303,443 232,634
Net income $ 23,000 $ 33,378 $ 35,532 $ 27,523 $ 33,286 $ 31,880 $ 28,649 $ 10,474 $ 19,088 $ 18,307 $ 16,239 $ 7,296 $ 119,433 $ 104,289 $ 60,930
Basic net income per share (in dollars per share) $ 0.37 [1] $ 0.52 [1] $ 0.55 [1] $ 0.42 [1] $ 0.50 [1] $ 0.48 [1] $ 0.42 [1] $ 0.15 [1] $ 0.28 [1] $ 0.26 [1] $ 0.23 [1] $ 0.11 [1] $ 1.87 $ 1.55 $ 0.88
Diluted net income per share (in dollars per share) $ 0.36 [1] $ 0.51 [1] $ 0.53 [1] $ 0.42 [1] $ 0.50 [1] $ 0.47 [1] $ 0.41 [1] $ 0.15 [1] $ 0.27 [1] $ 0.25 [1] $ 0.23 [1] $ 0.10 [1] $ 1.82 $ 1.50 $ 0.85
[1] Basic and diluted net income per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly net income per share may differ from annual net income per share due to rounding.