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Commitments and Contingencies - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Commitments And Contingencies [Line Items]
Natural gas transportation contracts, for the remainder of 2020	$ 4.1
Natural gas transportation contracts, 2021	21.5
Natural gas transportation contracts, 2022	31.2
Natural gas transportation contracts, 2023	24.8
Natural gas transportation contracts, 2024	24.9
Natural gas transportation contracts, 2025	24.8
Natural gas transportation contracts, remaining term	$ 144.8
Contract cancellable term related to drilling services	45 days
Commitments for contracted drilling services	$ 5.2
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.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Contract terms related to drilling services.

+ References

No definition available.

+ Details

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- Definition

Contract terms related to drilling services cancellable.

+ References

No definition available.

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X

- Definition

Amount of contractual obligation to be paid after fifth 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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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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X

- Definition

Amount of contractual obligation to be paid in fifth 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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- Definition

Amount of contractual obligation to be paid in fourth 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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Balance Type:	credit
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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).

+ References

No definition available.

+ Details

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- 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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- Definition

Amount of contractual obligation to be paid in third 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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- Definition

Amount of contractual obligation to be paid in remainder of current fiscal year.

+ References

No definition available.

+ Details

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