Derivative Instruments (Derivative (losses) gains in the consolidated statements of operations) (Detail) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|
Mar. 31, 2017 |
Mar. 21, 2017 |
Mar. 31, 2016 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Derivative Gains (Losses) [Line Items] | ||||||
| Change in fair value of commodity price derivatives | $ (13,807) | |||||
| Settlement gains on commodity price derivatives | 1,692 | |||||
| Total derivative (losses) gains | $ (12,115) | |||||
| Predecessor | ||||||
| Derivative Gains (Losses) [Line Items] | ||||||
| Change in fair value of commodity price derivatives | $ 46,721 | $ (35,554) | $ (176,607) | $ (88,317) | $ 228,903 | |
| Settlement gains on commodity price derivatives | 1,285 | 47,486 | 62,626 | 218,210 | 2,417 | |
| Settlement gains on early terminations of commodity price derivatives | 91,144 | 15,395 | ||||
| Total derivative (losses) gains | $ 48,006 | $ 11,932 | $ (22,837) | $ 145,288 | $ 231,320 | |