Organization and Nature of Business - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2017
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Percentage of crude oil and natural gas production concentrated in crude oil	56.00%
Percentage of crude oil and natural gas revenue concentrated in crude oil	76.00%
North Region [Member]
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Percentage of operations concentrated in geographic areas	57.00%
Percentage of revenues concentrated in geographic areas	66.00%
South Region [Member]
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Percentage of operations concentrated in geographic areas	43.00%
Percentage of revenues concentrated in geographic areas	34.00%