Earnings (Loss) per Share - Schedule of Computation of Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Earnings Per Share [Abstract] | ||||
| Net income (loss) | $ (21,505) | $ (8,059) | $ (18,742) | $ 35,679 |
| Basic weighted average common stock outstanding | 34,420,654 | 33,952,574 | 34,337,345 | 33,808,237 |
| Basic earnings (loss) per share | $ (0.62) | $ (0.24) | $ (0.55) | $ 1.06 |
| Basic and diluted loss per share | $ (0.62) | $ (0.24) | ||
| Diluted Earnings (Loss) per Share | ||||
| Net income (loss) | $ (21,505) | $ (8,059) | $ (18,742) | $ 35,679 |
| Add back: Interest expense on Exchangeable Notes | 2,542 | |||
| Net income (loss) allocated to common stockholders | $ (18,742) | $ 38,221 | ||
| Basic weighted average common stock outstanding | 34,420,654 | 33,952,574 | 34,337,345 | 33,808,237 |
| Net effect of dilutive equity awards | 439,264 | |||
| Net effect of assumed conversion of 5.0% Exchangeable Notes to common stock | 9,524,614 | |||
| Diluted weighted average common stock outstanding | 34,420,654 | 33,952,574 | 34,337,345 | 43,772,115 |
| Diluted earnings (loss) per share | $ (0.62) | $ (0.24) | $ (0.55) | $ 0.87 |