Quarterly report pursuant to Section 13 or 15(d)

Summary of Accounts Receivable (Detail)

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Summary of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Receivables [Abstract]    
Customers $ 22,920 $ 20,489
Joint interest partners 21,598 7,238
Other 670 3,789
Accounts Receivable, Gross, Current, Total 45,188 31,516
Less: Allowance for doubtful accounts (2,381) (2,421)
Accounts receivable, net of allowance for doubtful accounts $ 42,807 $ 29,095