Supplementary Data - Selected Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
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, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Quarterly Financial Information Disclosure [Abstract] | |||||||||||||||
| Net revenues | $ 28,417 | $ 25,608 | $ 24,969 | $ 26,355 | $ 26,505 | $ 23,749 | $ 22,433 | $ 17,615 | $ 25,492 | $ 33,941 | $ 38,605 | $ 33,298 | $ 105,349 | $ 90,302 | $ 131,336 |
| Net operating expenses | (29,365) | (29,543) | (34,689) | (31,460) | (33,564) | (32,201) | (34,534) | (34,869) | (38,671) | (272,462) | (46,970) | (45,686) | (125,057) | (135,168) | (403,789) |
| Interest expense, net | (5,370) | (5,304) | (4,916) | (5,463) | (7,086) | (7,067) | (6,808) | (6,298) | (6,436) | (6,465) | (6,243) | (5,922) | (21,053) | (27,259) | (25,066) |
| Gain on debt extinguishment | 5,053 | 9,080 | 1,483 | 5,053 | 10,563 | ||||||||||
| Write-off of debt issuance costs | (563) | (563) | |||||||||||||
| Commodity derivative (loss) gain | (1,377) | (3,560) | 1,231 | 3,444 | (2,901) | 1,541 | (6,667) | 2,543 | 4,267 | 13,051 | (4,623) | 6,580 | (262) | (5,484) | 19,275 |
| Other income (expense) | 29 | 3 | (10) | 1,417 | 104 | 225 | (91) | 12 | 26 | 32 | 1,511 | 172 | |||
| LOSS BEFORE INCOME TAX PROVISON (BENEFIT) | (7,695) | (12,770) | (13,405) | (2,068) | (17,046) | (13,988) | (24,722) | (20,905) | (6,043) | (230,543) | (19,219) | (11,704) | (35,938) | (76,661) | (267,509) |
| Income tax (benefit) provision | (53,512) | (4,258) | (4,509) | 138,700 | (3,571) | (4,915) | (8,687) | (7,245) | (284) | (81,756) | (7,369) | (3,996) | 76,421 | (24,418) | (93,405) |
| NET LOSS | $ 45,817 | $ (8,512) | $ (8,896) | $ (140,768) | $ (13,475) | $ (9,073) | $ (16,035) | $ (13,660) | $ (5,759) | $ (148,787) | $ (11,850) | $ (7,708) | $ (112,359) | $ (52,243) | $ (174,104) |
| Basic net earnings (loss) applicable to common stockholders per common share | $ 0.51 | $ (0.10) | $ (0.10) | $ (2.00) | $ (0.32) | $ (0.22) | $ (0.39) | $ (0.33) | $ (0.14) | $ (3.67) | $ (0.29) | $ (0.19) | $ (1.35) | $ (1.26) | $ (4.30) |
| Diluted net earnings (loss) applicable to common stockholders per common share | $ 0.51 | $ (0.10) | $ (0.10) | $ (2.00) | $ (0.32) | $ (0.22) | $ (0.39) | $ (0.33) | $ (0.14) | $ (3.67) | $ (0.29) | $ (0.19) | $ (1.35) | $ (1.26) | $ (4.30) |