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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
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, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Quarterly Financial Information [Line Items]                              
Net sales $ 543,444 $ 425,098 $ 435,903 $ 362,716 $ 462,057 $ 464,272 $ 471,439 $ 447,676 $ 543,711 $ 531,350 $ 514,831 $ 437,597 $ 1,767,161 $ 1,845,444 $ 2,027,489
Gross profit 72,876 60,963 67,679 59,357 71,485 83,459 91,064 79,526 87,819 86,022 72,405 57,197 260,875 325,534 303,443
Net income $ 49,357 $ 18,947 $ 22,945 $ 20,173 $ 23,000 $ 33,378 $ 35,532 $ 27,523 $ 33,286 $ 31,880 $ 28,649 $ 10,474 $ 111,422 $ 119,433 $ 104,289
Basic net income per share (in dollars per share) $ 0.84 [1] $ 0.32 [1] $ 0.38 [1] $ 0.34 [1] $ 0.37 [1] $ 0.52 [1] $ 0.55 [1] $ 0.42 [1] $ 0.50 [1] $ 0.48 [1] $ 0.42 [1] $ 0.15 [1] $ 1.88 $ 1.87 $ 1.55
Diluted net income per share (in dollars per share) $ 0.80 [1] $ 0.30 [1] $ 0.36 [1] $ 0.32 [1] $ 0.36 [1] $ 0.51 [1] $ 0.53 [1] $ 0.42 [1] $ 0.50 [1] $ 0.47 [1] $ 0.41 [1] $ 0.15 [1] $ 1.78 $ 1.82 $ 1.5
[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.