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Additional Balance Sheet Information - Components of Balance Sheet Amounts (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross $ 389,128 $ 372,952
Allowance for doubtful accounts (1,526) (1,573)
Total accounts receivable, net 387,602 371,379
Revenue suspense 75,685 68,015
Royalties payable 124,884 126,761
Production taxes payable 16,126 19,219
Total revenue and production taxes payable 216,695 213,995
Accrued capital costs 216,079 154,625
Accrued lease operating expenses 26,988 26,215
Accrued oil and gas purchases 32,713 21,394
Accrued general and administrative expenses 23,901 17,915
Accrued midstream and well services operating expenses 17,521 15,293
Other accrued liabilities 14,449 8,837
Total accrued liabilities 331,651 244,279
Trade accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross 234,231 241,459
Joint interest accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross 93,939 73,588
Other accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross $ 60,958 $ 57,905