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Additional Balance Sheet Information - Components of Balance Sheet Amounts (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]    
Trade accounts $ 233,660 $ 137,065
Joint interest accounts 73,588 40,322
Other accounts 57,905 28,257
Total 365,153 205,644
Allowance for doubtful accounts (1,573) (1,309)
Total accounts receivable, net 363,580 204,335
Revenue suspense 68,015 55,484
Royalties payable 126,761 73,033
Production taxes payable 19,219 11,220
Total revenue and production taxes payable 213,995 139,737
Accrued capital costs 154,625 69,311
Accrued lease operating expenses 26,215 22,221
Accrued oil and gas purchases 13,595 0
Accrued general and administrative expenses 17,915 19,061
Accrued midstream and well services operating expenses 15,293 2,365
Other accrued liabilities 8,837 6,215
Total accrued liabilities $ 236,480 $ 119,173