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Earnings (Loss) per Common Share - Computation of Basic and Diluted Loss Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Equity [Abstract]                      
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)
Less: Preferred stock dividends                 0 0 3,332
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)
Weighted-average common shares outstanding—basic (usd per share)                 83,116 77,559 72,809
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)
Options and restricted stock                 1,495 826 0
Weighted-average common shares outstanding—diluted (usd per share)                 84,611 78,385 72,809
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)