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Commitments and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Commitments And Contingencies [Line Items]
Natural gas transportation contracts, 2021	$ 21.5
Natural gas transportation contracts, 2022	31.2
Natural gas transportation contracts, 2023 through 2030	$ 24.8
Contract cancellable term related to drilling services	45 days
Commitments for contracted drilling services	$ 6.0
Maximum
Commitments And Contingencies [Line Items]
Contract term related to drilling services	1 year

X

- Definition

Commitments and contingencies.

+ References

No definition available.

+ Details

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- Definition

Commitments for contracted drilling services.

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No definition available.

+ Details

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X

- Definition

Contract terms related to drilling services.

+ References

No definition available.

+ Details

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X

- Definition

Contract terms related to drilling services cancellable.

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No definition available.

+ Details

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- Definition

Contractual Obligation, to be Paid, after Year Two

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No definition available.

+ Details

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X

- Definition

Amount of contractual obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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No definition available.

+ Details

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X

- Definition

Amount of contractual obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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