Annual report pursuant to Section 13 and 15(d)

Reconciliation of Income and Number of Shares Used to Calculate Basic and Diluted Earnings per Share (EPS) - Summary of Reconciliation of Income and Number of Shares Used to Calculate Basic and Diluted Earnings per Share (EPS) (Detail)

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Reconciliation of Income and Number of Shares Used to Calculate Basic and Diluted Earnings per Share (EPS) - Summary of Reconciliation of Income and Number of Shares Used to Calculate Basic and Diluted Earnings per Share (EPS) (Detail) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]                      
EPS, income $ (48,929,000) $ (46,228,000) $ (39,822,000) $ (95,835,000) $ (35,646,000) $ (48,620,000) $ (14,029,000) $ 3,222,000 $ (230,814,000) $ (95,073,000) $ 23,451,000
Basic EPS, shares                 124,130,004 122,562,187 121,186,464
Basic earnings (loss) per share: $ (0.39) $ (0.37) $ (0.32) $ (0.78) $ (0.29) $ (0.40) $ (0.11) $ 0.03 $ (1.86) $ (0.78) $ 0.19
Stock options and restricted stock, shares                 0 0 1,890,184
Stock options and restricted stock, per share amount 0.00       0.00       $ 0.00 $ 0.00 $ 0.00
Diluted EPS, shares                 124,130,004 122,562,187 123,076,648
Diluted earnings (loss) per share: $ (0.39) $ (0.37) $ (0.32) $ (0.78) $ (0.29) $ (0.40) $ (0.11) $ 0.03 $ (1.86) $ (0.78) $ 0.19