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Summary of Significant Accounting Policies - Schedule of Derivative Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Net Fair Value Presented in the Consolidated Balance Sheet, Liabilities Derivatives - current	$ 2,849
Predecessor
Derivative [Line Items]
Net Fair Value Presented in the Consolidated Balance Sheet, Asset Derivatives - current		$ 1,318
Natural Gas Price Derivatives | Derivative Financial Instruments – Current
Derivative [Line Items]
Asset Derivatives, Fair Value	18
Gross Amounts Offset in the Consolidated Balance Sheet, Assets Derivatives	(18)
Net Fair Value Presented in the Consolidated Balance Sheet, Asset Derivatives - current	0
Liability Derivatives, Fair Value	854
Gross Amounts Offset in the Consolidated Balance Sheet, Liabilities Derivatives	(18)
Net Fair Value Presented in the Consolidated Balance Sheet, Liabilities Derivatives - current	836
Natural Gas Price Derivatives | Predecessor | Derivative Financial Instruments – Current
Derivative [Line Items]
Asset Derivatives, Fair Value		1,318
Gross Amounts Offset in the Consolidated Balance Sheet, Assets Derivatives		0
Net Fair Value Presented in the Consolidated Balance Sheet, Asset Derivatives - current		$ 1,318
Crude Oil Price Derivatives | Derivative Financial Instruments – Current
Derivative [Line Items]
Liability Derivatives, Fair Value	2,013
Net Fair Value Presented in the Consolidated Balance Sheet, Liabilities Derivatives - current	$ 2,013

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