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Commitments and contingencies - Estimates of Future Commitments (Detail) - USD ($) $ in Thousands | Oct. 30, 2018 | Dec. 31, 2019
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Commitments Disclosure [Line Items] |  |
Year 1 |  | $ 273,117
Year 2 |  | 234,056
Year 3 |  | 108,853
Year 4 |  | 110,418
Year 5 |  | 107,257
Thereafter |  | 809,665
Total |  | 1,643,366
Power purchase |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 30,672
Year 2 |  | 11,422
Year 3 |  | 11,338
Year 4 |  | 11,566
Year 5 |  | 11,796
Thereafter |  | 179,412
Total |  | 256,206
Gas supply and service agreements |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 83,083
Year 2 |  | 60,699
Year 3 |  | 49,217
Year 4 |  | 46,406
Year 5 |  | 41,538
Thereafter |  | 135,926
Total |  | 416,869
Service agreements |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 47,950
Year 2 |  | 40,456
Year 3 |  | 41,554
Year 4 |  | 45,611
Year 5 |  | 47,005
Thereafter |  | 293,436
Total |  | 516,012
Capital projects |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 104,809
Year 2 |  | 114,806
Year 3 |  | 0
Year 4 |  | 0
Year 5 |  | 0
Thereafter |  | 0
Total |  | 219,615
Land easements |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 6,603
Year 2 |  | 6,673
Year 3 |  | 6,744
Year 4 |  | 6,835
Year 5 |  | 6,918
Thereafter |  | 200,891
Total |  | $ 234,664
Gaia Power Inc. vs APUC |  |
Commitments Disclosure [Line Items] |  |
Damages claimed by other party in lawsuit | $ 345,000 |
Punitive damages claimed by other party in lawsuit | $ 25,000 |

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