Annual report pursuant to Section 13 and 15(d)

Quarterly Data - Schedule of Quarterly Data (Detail)

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Quarterly Data - Schedule of Quarterly Data (Detail) (USD $)
In Thousands, 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 $ 172,629 $ 192,382 $ 192,711 $ 143,919 $ 131,682 $ 148,169 $ 147,241 $ 128,373 $ 701,641 $ 555,465 $ 506,526
Income from operations 8,655 22,429 17,573 7,784 3,611 13,581 14,941 8,835 56,441 40,968 38,453
Net (loss) income $ (2,974) $ 1,748 $ 4,663 $ (4,585) $ (6,810) $ 1,107 $ 1,056 $ (2,587) $ (1,148) $ (7,234) $ (9,779)