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Summary of Significant Accounting Policies - Schedule of Derivative Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Net Fair Value Presented in the Consolidated Balance Sheet, Asset Derivatives - current		$ 1,318
Net Fair Value Presented in the Consolidated Balance Sheet, Liabilities Derivatives - current	$ 230
Natural Gas Price Derivatives | Derivative Financial Instruments – Current
Derivative [Line Items]
Asset Derivatives, Fair Value	79	1,318
Gross Amounts Offset in the Consolidated Balance Sheet, Assets Derivatives	(79)	0
Net Fair Value Presented in the Consolidated Balance Sheet, Asset Derivatives - current	0	$ 1,318
Liability Derivatives, Fair Value	309
Gross Amounts Offset in the Consolidated Balance Sheet, Liabilities Derivatives	(79)
Net Fair Value Presented in the Consolidated Balance Sheet, Liabilities Derivatives - current	$ 230

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