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Fair Value Measurements of Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Fair Value Disclosures [Abstract]        
Impairment of proved oil and natural gas properties $ 0 $ 0 $ 0 $ 0