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Business acquisitions and development projects - Acquisition of Park Water System (Details) CAD in Thousands, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 08, 2016 CAD water_utility | Jan. 08, 2016 USD ($) water_utility | Dec. 31, 2017 CAD | Dec. 31, 2016 CAD | Dec. 31, 2015 CAD
Business Acquisition [Line Items] |  |  |  |  |
Goodwill (note 6) |  |  | CAD 1,196,234 | CAD 306,641 | CAD 110,493
Park Water Company |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Working capital | CAD 2,045 |  |  |  |
Property, plant and equipment | 345,254 |  |  |  |
Notes receivable | 1,781 |  |  |  |
Goodwill (note 6) | 210,463 |  |  |  |
Regulatory assets | 54,548 |  |  |  |
Other assets | 185 |  |  |  |
Long-term debt | (146,727) |  |  |  |
Regulatory liabilities | (3,758) |  |  |  |
Pension and OPEB | (18,747) |  |  |  |
Deferred income tax liability, net | (51,795) |  |  |  |
Other liabilities | (40,172) |  |  |  |
Total net assets acquired | CAD 353,077 |  |  |  |
Number of regulated water utilities | water_utility | 3 | 3 |  |  |
Business combination, purchase price | CAD 353,077 | $ 249,540 |  |  |
Business combination, liabilities incurred | $ |  | $ 91,750 |  |  |
Revenue |  |  | 91,817 | 96,695 |
Pre-tax net earnings |  |  | CAD 17,620 | CAD 25,374 |
Weighted Average | Park Water Company |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated useful lives | 40 years | 40 years |  |  |

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