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Supplementary Oil and Gas Information - Additional Information (Detail)
a in Thousands
Jun. 30, 2019
a
Wells
Disclosure of oil and gas producing activities [line items]  
Operated wells that had multiple completions, gross | Wells 43
Operated wells that had multiple completions, net | Wells 18
Expiring June 2019 [member]  
Disclosure of oil and gas producing activities [line items]  
Approximately acres of undeveloped acreage that will expire, gross 126
Approximately acres of undeveloped acreage that will expire, net 59
Expiring June 2020 [member]  
Disclosure of oil and gas producing activities [line items]  
Approximately acres of undeveloped acreage that will expire, gross 1,612
Approximately acres of undeveloped acreage that will expire, net 932
Expiring June 2021 [member]  
Disclosure of oil and gas producing activities [line items]  
Approximately acres of undeveloped acreage that will expire, gross 1,257
Approximately acres of undeveloped acreage that will expire, net 889