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Summary of Significant Accounting Policies - Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accrued Liabilities, Current [Abstract]
Accrued drilling costs	$ 6,028	$ 5,874
Accrued interest payable	20,937	21,277
Accrued transportation costs	2,882	3,269
Accrued employee compensation	2,561	6,449
Asset retirement obligation – assets held for sale		4,557
Accrued ad valorem taxes	1,200
Other	1,848	1,029
Total accrued expenses	$ 35,456	$ 42,455

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Accrued ad valorem taxes payable.

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Accrued asset retirement obligation assets held for sale.

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Accrued drilling costs.

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Accrued transportation costs.

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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-Topic 210
-SubTopic 10
-Section S99
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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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