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Summary of Significant Accounting Policies - Summary of Unaudited Pro Forma Financial Information (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended
Aug. 13, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
 [1]
Sep. 30, 2017
Revenues:          
Total oil and gas sales   $ 70,123      
Operating expenses:          
Production taxes   4,051      
Gathering and transportation   3,450      
Lease operating   7,016      
Depreciation, depletion and amortization   17,820      
General and administrative   3,303      
Loss (gain) on sale of oil and gas properties   (98)      
Total operating expenses   35,542      
Operating income   34,581      
Other income (expenses):          
Gain (loss) from derivative financial instruments   (2,015)      
Other income   42      
Interest expense   (14,845)      
Total other income (expenses)   (16,818)      
Income (loss) before income taxes   17,763      
Benefit from (provision for) income taxes   (3,940)      
Net income (loss)   $ 13,823      
Net income (loss) per share – basic and diluted $ (1.09) $ 0.13 $ (1.67)    
Weighted average shares outstanding –          
Basic   105,448      
Diluted   105,463      
Natural Gas Sales          
Revenues:          
Total oil and gas sales   $ 36,393      
Oil Sales          
Revenues:          
Total oil and gas sales   $ 33,730      
Pro Forma          
Revenues:          
Total oil and gas sales       $ 390,377 $ 318,491
Operating expenses:          
Production taxes       22,168 16,722
Gathering and transportation       15,291 12,428
Lease operating       44,103 43,309
Depreciation, depletion and amortization       132,234 148,100
General and administrative       19,319 19,134
Loss (gain) on sale of oil and gas properties       35,340 1,060
Total operating expenses       268,455 240,753
Operating income       121,922 77,738
Other income (expenses):          
Gain (loss) from derivative financial instruments       (1,134) 14,585
Other income       719 398
Interest expense       (80,437) (89,063)
Total other income (expenses)       (80,852) (74,080)
Income (loss) before income taxes       41,070 3,658
Benefit from (provision for) income taxes       (10,818) (2,211)
Net income (loss)       $ 30,252 $ 1,447
Net income (loss) per share – basic and diluted       $ 0.29 $ 0.01
Weighted average shares outstanding –          
Basic       105,448 105,095
Diluted       105,463 105,574
Pro Forma | Natural Gas Sales          
Revenues:          
Total oil and gas sales       $ 196,049 $ 158,679
Pro Forma | Oil Sales          
Revenues:          
Total oil and gas sales       $ 194,328 $ 159,812
[1] Excludes $2.6 million of transaction costs associated with the Jones Contribution.