Quarterly Information - Quarterly Information - Unaudited (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 77,055	$ 64,433	$ 69,938	$ 69,624	$ 77,154	$ 72,190	$ 69,956	$ 73,605	$ 281,050	$ 292,905	$ 344,816
Gross profit	18,290	16,256	14,628	14,534	17,852	16,124	15,654	17,369
Net income (loss)	(1,500)	12,705	1,106	126	3,319	1,528	1,508	2,000	12,437	8,355	21,309
Net income (loss) per common share:
Basic	$ (0.14)	$ 1.23	$ 0.11	$ 0.01	$ 0.32	$ 0.15	$ 0.15	$ 0.19	$ 1.20	$ 0.81	$ 2.07
Diluted	$ (0.14)	$ 1.22	$ 0.11	$ 0.01	$ 0.32	$ 0.15	$ 0.15	$ 0.19	$ 1.20	$ 0.80	$ 2.05
Comprehensive income (loss)	$ 30,408	$ 17,478	$ 2,387	$ (1,326)	$ (5,815)	$ 4,362	$ 1,278	$ 5,445	$ 48,947	$ 5,270	$ 1,493