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Summarized Quarterly Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 153,331 $ 175,780 $ 230,504 $ 284,179 $ 134,606 $ 168,572 $ 231,893 $ 351,874 $ 843,794 $ 886,945 $ 842,801
Gross profit 51,068 77,602 101,697 127,266 36,916 65,307 90,806 164,897 357,633 357,926 314,758
Net income (loss) (30,452) (3,617) 12,818 35,819 (41,539) (1,134) 3,369 55,312 14,568 16,008 (18,921)
Net income (loss) allocable to common shareholders $ (30,452) $ (3,617) $ 12,818 $ 35,819 $ (41,539) $ (1,134) $ 3,369 $ 55,312 $ 14,568 $ 16,008 $ (22,253)
Earnings (loss) per common share                      
Basic earnings (loss) per common share (usd per share) $ (0.33) $ (0.04) $ 0.16 $ 0.46 $ 0.54 $ (0.01) $ 0.04 $ 0.71 $ 0.18 $ 0.21 $ (0.31)
Dilutive earnings (loss) per common share (usd per share) $ (0.33) $ (0.04) $ 0.15 $ 0.39 $ 0.54 $ (0.01) $ 0.04 $ 0.61 $ 0.17 $ 0.20 $ (0.31)