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Commitments and contingencies - Estimates of Future Commitments (Detail) $ in Thousands, $ in Thousands | Oct. 30, 2018 CAD ($) | Jun. 30, 2019 USD ($)
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Commitments Disclosure [Line Items] |  |
Year 1 |  | $ 238,786
Year 2 |  | 157,217
Year 3 |  | 83,915
Year 4 |  | 85,148
Year 5 |  | 83,511
Thereafter |  | 745,078
Total |  | 1,393,655
Power purchase |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 32,904
Year 2 |  | 11,004
Year 3 |  | 11,225
Year 4 |  | 11,452
Year 5 |  | 11,680
Thereafter |  | 185,349
Total |  | 263,614
Gas supply and service agreements |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 68,216
Year 2 |  | 41,036
Year 3 |  | 26,969
Year 4 |  | 25,109
Year 5 |  | 20,279
Thereafter |  | 39,648
Total |  | 221,257
Service agreements |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 47,206
Year 2 |  | 39,575
Year 3 |  | 39,025
Year 4 |  | 41,813
Year 5 |  | 44,685
Thereafter |  | 316,099
Total |  | 528,403
Capital projects |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 83,990
Year 2 |  | 58,976
Year 3 |  | 0
Year 4 |  | 0
Year 5 |  | 0
Thereafter |  | 0
Total |  | 142,966
Land easements (note 1(c)) |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 6,470
Year 2 |  | 6,626
Year 3 |  | 6,696
Year 4 |  | 6,774
Year 5 |  | 6,867
Thereafter |  | 203,982
Total |  | $ 237,415
Gaia Power Inc. vs APUC |  |
Commitments Disclosure [Line Items] |  |
Damages sought | $ 345,000 |
Puntitive damages sought | $ 25,000 |

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