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Subsequent Events - Additional Information (Detail) - Subsequent Event - Caddo and DeSoto Parish, North Louisiana Properties
$ in Millions
Jul. 31, 2018
USD ($)
a
Well
Location
Subsequent Event [Line Items]  
Acquired oil and gas properties | $ $ 37.0
Oil and gas properties, gross acres | a 21,000
Oil and gas properties, net acres | a 9,900
Producing natural gas wells, gross | Well 120
Producing natural gas wells, net | Well 26.2
Producing Haynesville shale natural gas wells, gross | Well 49
Producing Haynesville shale natural gas wells, net | Well 14.7
Potential drilling locations, gross | Location 112
Potential drilling locations, net | Location 31.0
Potential operated drilling locations, gross | Location 21
Potential operated drilling locations, net | Location 17.9