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Interim Financial Data (Unaudited) - Summary of Interim Financial Data (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 Data [Abstract]                      
Net sales $ 63,831 $ 72,249 $ 98,551 $ 107,880 $ 46,155 $ 70,819 $ 94,279 $ 96,100 $ 342,511 $ 307,354 $ 266,789
Gross profit 19,685 151 36,922 41,860 13,426 2,146 33,590 35,419 98,618 84,582 62,791
Net income (loss) $ 15,103 $ (15,298) $ 13,224 $ 21,569 $ (3,619) $ (14,312) $ 8,339 $ 12,311 $ 34,598 $ 2,720 $ (11,588)
Basic net income (loss) per share $ 0.91 $ (0.91) $ 0.78 $ 1.28 $ (0.22) $ (0.86) $ 0.54 $ 0.80 $ 2.06 $ 0.17 $ (0.75)
Diluted net income (loss) per share $ 0.90 $ (0.91) $ 0.76 $ 1.25 $ (0.22) $ (0.86) $ 0.48 $ 0.74 $ 2.02 $ 0.16 $ (0.75)