Quarterly Financial Result - Schedule of Selected Consolidated Statements 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, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 174,580	$ 176,697	$ 166,685	$ 161,710	$ 180,462	$ 192,296	$ 167,106	$ 148,105	$ 679,672	$ 687,969	$ 633,712
Gross profit	49,351	50,310	46,662	41,570	46,089	39,139	36,749	34,249	187,893	156,226	134,864
Operating income (loss)	7,637	15,490	9,742	6,367	5,229	618	(7,377)	4,267	39,236	2,737	(42,934)
Net income (loss)	$ 43,653	$ 5,604	$ (8,059)	$ 43,738	$ (49,790)	$ 29,866	$ (17,816)	$ 8,125	$ 84,936	$ (29,615)	$ (84,867)
Earnings (loss) per share:
Basic	$ 1.28	$ 0.16	$ (0.24)	$ 1.30	$ (1.42)	$ 0.86	$ (0.51)	$ 0.23	$ 2.50	$ (0.85)	$ (2.47)
Diluted	$ 0.99	$ 0.15	$ (0.24)	$ 1.05	$ (1.42)	$ 0.85	$ (0.51)	$ 0.23	$ 2.02	$ (0.85)	$ (2.47)
Weighted average common stock outstanding:
Basic	34,176,812	34,103,029	33,952,574	33,662,297	35,068,330	34,849,805	34,716,081	34,698,904	33,943,264	34,833,967	34,380,517
Diluted	45,573,889	45,542,418	33,952,574	42,892,044	35,068,330	35,302,706	34,716,081	34,918,568	44,755,137	34,833,967	34,380,517