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Summary of Significant Accounting Policies - Summary of Oil and Gas Properties (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Mineral interests in properties:    
Unproved leasehold costs $ 37,853 $ 46,240
Proved leasehold costs 44,122 42,409
Wells and related equipment and facilities 1,753,649 1,592,477
Support equipment 9,545 8,518
Uncompleted wells, equipment and facilities 8,612 18,634
Total costs 1,853,781 1,708,278
Less accumulated depreciation, depletion and amortization (702,139) (379,892)
Net capitalized costs $ 1,151,642 $ 1,328,386