v2.4.1.9

Quarterly Financial Information (Unaudited) - Summary of Unaudited 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
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 285,342us-gaap_SalesRevenueGoodsNet	$ 297,351us-gaap_SalesRevenueGoodsNet	$ 307,088us-gaap_SalesRevenueGoodsNet	$ 277,198us-gaap_SalesRevenueGoodsNet	$ 293,514us-gaap_SalesRevenueGoodsNet	$ 309,927us-gaap_SalesRevenueGoodsNet	$ 289,460us-gaap_SalesRevenueGoodsNet	$ 265,351us-gaap_SalesRevenueGoodsNet	$ 1,166,979us-gaap_SalesRevenueGoodsNet	$ 1,158,252us-gaap_SalesRevenueGoodsNet	$ 1,072,348us-gaap_SalesRevenueGoodsNet
Gross profit	25,217us-gaap_GrossProfit	34,073us-gaap_GrossProfit	33,512us-gaap_GrossProfit	32,176us-gaap_GrossProfit	32,716us-gaap_GrossProfit	37,904us-gaap_GrossProfit	40,151us-gaap_GrossProfit	24,301us-gaap_GrossProfit	124,977us-gaap_GrossProfit	135,072us-gaap_GrossProfit	90,327us-gaap_GrossProfit
Net income (loss)	$ 5,053us-gaap_NetIncomeLoss	$ 11,063us-gaap_NetIncomeLoss	$ 10,154us-gaap_NetIncomeLoss	$ 10,854us-gaap_NetIncomeLoss	$ 11,212us-gaap_NetIncomeLoss	$ 13,802us-gaap_NetIncomeLoss	$ 15,502us-gaap_NetIncomeLoss	$ 6,395us-gaap_NetIncomeLoss	$ 37,123us-gaap_NetIncomeLoss	$ 46,910us-gaap_NetIncomeLoss	$ 19,811us-gaap_NetIncomeLoss
Net income (loss) per common share - basic (in usd per share)	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.53us-gaap_EarningsPerShareBasic	$ 0.49us-gaap_EarningsPerShareBasic	$ 0.52us-gaap_EarningsPerShareBasic	$ 0.54us-gaap_EarningsPerShareBasic	$ 0.67us-gaap_EarningsPerShareBasic	$ 0.75us-gaap_EarningsPerShareBasic	$ 0.31us-gaap_EarningsPerShareBasic	$ 1.79us-gaap_EarningsPerShareBasic	$ 2.27us-gaap_EarningsPerShareBasic	$ 0.91us-gaap_EarningsPerShareBasic
Net income (loss) per common share - diluted (in usd per share)	$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.53us-gaap_EarningsPerShareDiluted	$ 0.49us-gaap_EarningsPerShareDiluted	$ 0.52us-gaap_EarningsPerShareDiluted	$ 0.54us-gaap_EarningsPerShareDiluted	$ 0.66us-gaap_EarningsPerShareDiluted	$ 0.75us-gaap_EarningsPerShareDiluted	$ 0.31us-gaap_EarningsPerShareDiluted	$ 1.78us-gaap_EarningsPerShareDiluted	$ 2.26us-gaap_EarningsPerShareDiluted	$ 0.91us-gaap_EarningsPerShareDiluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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