Commitments and contingencies - Estimates of Future Commitments (Detail) $ in Thousands	Dec. 31, 2022 USD ($)
Commitments Disclosure [Line Items]
Year 1	$ 291,556
Year 2	185,411
Year 3	159,078
Year 4	115,909
Year 5	104,325
Thereafter	1,093,025
Total	1,949,304
Power purchase
Commitments Disclosure [Line Items]
Year 1	89,846
Year 2	32,490
Year 3	32,726
Year 4	12,274
Year 5	12,520
Thereafter	142,586
Total	322,442
Gas supply and service agreements
Commitments Disclosure [Line Items]
Year 1	113,775
Year 2	81,719
Year 3	57,014
Year 4	40,372
Year 5	31,457
Thereafter	188,138
Total	512,475
Service agreements
Commitments Disclosure [Line Items]
Year 1	67,477
Year 2	57,886
Year 3	55,835
Year 4	49,596
Year 5	46,511
Thereafter	298,516
Total	575,821
Capital projects
Commitments Disclosure [Line Items]
Year 1	7,163
Year 2	0
Year 3	0
Year 4	0
Year 5	0
Thereafter	0
Total	7,163
Land easements and others
Commitments Disclosure [Line Items]
Year 1	13,295
Year 2	13,316
Year 3	13,503
Year 4	13,667
Year 5	13,837
Thereafter	463,785
Total	$ 531,403

Commitments Disclosure [Line Items]

No definition available.

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- Definition

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

+ References

No definition available.

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- 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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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.

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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.

+ 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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