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Exploration License - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jul. 09, 2019
Business Acquisition [Line Items]
Impairment expense	$ 0	$ 0
Bismarck [Member]
Business Acquisition [Line Items]
Annual Fee Due			$ 14,000
Accounting Standards Update 2017-01 [Member]
Business Acquisition [Line Items]
Percent of ownership acquired	79.90%
Accounting Standards Update 2017-01 [Member] | Bismarck [Member]
Business Acquisition [Line Items]
Percent of ownership acquired			79.90%

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The adjustment to expense previously capitalized costs of drilling exploratory wells when proved reserves are not found or when the entity obtains information that raises substantial doubt about the economic or operational viability of the project.

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