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Summary of Significant Accounting Policies - Summary of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accrued Liabilities Current [Abstract]      
Ad valorem and production taxes $ 6,193 $ 4,299  
Employee compensation 6,595 8,667  
Royalties 39,969 9,660  
Short term derivatives   14,875  
Other 4,152 4,161  
Total accrued liabilities $ 56,909 $ 41,662 $ 55,044