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Related party transactions (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
NL Partnership |  |
Related Party Transaction [Line Items] |  |
Revenue | $ 41 |
Management fee revenue | (7) |
Interest revenue | 12 |
Distributions | 0 |
Rent expense | 0 |
Accounts receivable | 0 |
Accounts payable and accrued liabilities | 2,355 |
Affiliates |  |
Related Party Transaction [Line Items] |  |
Revenue | 636 |
Management fee revenue | 352 |
Interest revenue | 56 |
Distributions | (102) |
Rent expense | 38 |
Accounts receivable | 13 |
Accounts payable and accrued liabilities | 719 |
Director |  |
Related Party Transaction [Line Items] |  |
Sublease proceeds | $ 315 | $ 332

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