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Commitments and contingencies - Estimates of Future Commitments (Detail) $ in Thousands	Dec. 31, 2023 USD ($)
Commitments Disclosure [Line Items]
Year 1	$ 272,222
Year 2	182,764
Year 3	126,777
Year 4	114,300
Year 5	112,108
Thereafter	1,080,214
Total	1,888,385
Power purchase
Commitments Disclosure [Line Items]
Year 1	55,312
Year 2	33,869
Year 3	12,274
Year 4	12,520
Year 5	12,768
Thereafter	129,818
Total	256,561
Natural gas supply and service agreements
Commitments Disclosure [Line Items]
Year 1	121,188
Year 2	71,949
Year 3	42,643
Year 4	33,215
Year 5	30,803
Thereafter	154,757
Total	454,555
Service agreements
Commitments Disclosure [Line Items]
Year 1	73,687
Year 2	61,889
Year 3	56,591
Year 4	53,140
Year 5	52,898
Thereafter	259,510
Total	557,715
Capital projects
Commitments Disclosure [Line Items]
Year 1	5,598
Year 2	0
Year 3	0
Year 4	0
Year 5	0
Thereafter	0
Total	5,598
Land easements and other
Commitments Disclosure [Line Items]
Year 1	16,437
Year 2	15,057
Year 3	15,269
Year 4	15,425
Year 5	15,639
Thereafter	536,129
Total	$ 613,956

X

- Definition

Commitments Disclosure [Line Items]

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation, including, but not limited to, long-term debt, lease obligation, purchase obligation, and other commitments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-3

+ Details

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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.

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- Definition

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+ References

No definition available.

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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.

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- 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.

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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.

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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.

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