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Investment in partnership - Balance Sheet Financial Data (Details) - CAD CAD in Thousands | Dec. 31, 2017 | Apr. 01, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Current assets | CAD 89,280 |  | CAD 74,946
Total Assets | 383,644 |  | 350,081
Liabilities | 79,030 |  | 74,028
Total Liabilities | 237,720 |  | 191,127
Loan to partnership (note 24) | 969 |  | 0
Partnership Interest |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Current assets | 1,868 |  | 0
Non-current assets | 2,275 |  | 0
Total Assets | 4,143 | CAD 3,745 | 0
Liabilities | 1,094 |  | 0
Long-term liabilities | 1,141 |  | 0
Total Liabilities | 2,235 | CAD 1,437 | 0
Net Assets | CAD 1,908 |  | CAD 0
Undivided ownership interest, percentage | 49.00% |  |
Parent Company |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Loan to partnership (note 24) | CAD 1,900 |  |

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