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
Sep. 30, 2017
Dec. 31, 2016
Receivables [Abstract]    
Customers $ 30,852 $ 20,489
Joint interest partners 18,938 7,238
Other 668 3,789
Accounts Receivable, Gross, Current, Total 50,458 31,516
Less: Allowance for doubtful accounts (2,362) (2,421)
Accounts receivable, net of allowance for doubtful accounts $ 48,096 $ 29,095