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Summary of Significant Accounting Policies - Net Capitalized Costs and Associated Accumulated Depreciation, Depletion & Amortization and Non Cash Impairments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Proved properties $ 679,200 $ 663,485
Wells and related equipment and facilities 1,786,836 1,438,092
Support equipment and facilities 91,915 75,392
Materials and supplies 23,845 18,341
Total proved oil and gas properties 2,581,796 2,195,310
Unproved properties 319,265 328,409
Wells and facilities in progress 74,645 139,799
Total unproved oil and gas properties, excluded from amortization 393,910 468,208
Accumulated depreciation, depletion, amortization and impairment (868,529) (642,645)
Total oil and gas properties, net $ 2,107,177 $ 2,020,873