Quarterly Financial Data - Schedule of Quarterly Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Net sales	$ 181,277	$ 171,046	$ 201,662	$ 178,525	$ 149,035	$ 177,350	$ 202,223	$ 150,679	$ 732,510	$ 679,287	$ 759,031
Gross profit	31,378	24,386	48,869	48,722	30,566	48,909	38,659	25,422	153,355	143,556	183,736
Income (loss) from continuing operations	718	(3,772)	11,134	11,643	37,473	10,250	7,486	(68)	19,723	55,141	58,786
Net loss (income) from discontinued operations	61	5	21	2	130	(10)	59		89	179	182
Net income (loss)	657	(3,777)	11,113	11,641	37,343	10,260	7,427	(68)	19,634	54,962	58,604
Net income (loss) applicable to common stock	$ 657	$ (3,777)	$ 11,113	$ 11,341	$ 37,343	$ 10,260	$ 7,427	$ (368)	$ 19,334	$ 54,662	$ 58,304
Basic:
Income (loss) from continuing operations	$ 0.03	$ (0.17)	$ 0.49	$ 0.50	$ 1.67	$ 0.46	$ 0.33	$ (0.02)	$ 0.86	$ 2.44	$ 2.62
Net loss from discontinued operations					$ (0.01)					$ (0.01)	$ (0.01)
Net income (loss)	$ 0.03	$ (0.17)	$ 0.49	$ 0.50	$ 1.66	$ 0.46	$ 0.33	$ (0.02)	$ 0.86	$ 2.43	$ 2.61
Diluted:
Income (loss) from continuing operations	$ 0.03	$ (0.17)	$ 0.47	$ 0.49	$ 1.59	$ 0.43	$ 0.31	$ (0.02)	$ 0.83	$ 2.34	$ 2.50
Net loss from discontinued operations					$ (0.01)					$ (0.01)	$ (0.01)
Net income (loss)	$ 0.03	$ (0.17)	$ 0.47	$ 0.49	$ 1.58	$ 0.43	$ 0.31	$ (0.02)	$ 0.83	$ 2.33	$ 2.49