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Equity Exchange Transactions - Summary of Preliminary Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - Bolt-On Acquisition [Member]
$ in Thousands
Nov. 20, 2017
USD ($)
Business Acquisition [Line Items]  
Accounts receivable $ 558
Proved leasehold costs 13,865
Lease and well equipment 3,466
Total assets acquired 17,889
Accounts payable (106)
Oil, NGLs and gas sales payable (255)
Accrued liabilities (25)
Asset retirement obligations (71)
Total liabilities assumed (457)
Estimated fair value of net assets acquired $ 17,432