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Long term debt - Credit Facility Narrative (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 CAD ($) convenant | Dec. 31, 2017 CAD ($) | Dec. 08, 2018 CAD ($) | Nov. 23, 2018 CAD ($) | Aug. 01, 2017 CAD ($)
Line of Credit Facility [Line Items] |  |  |  |  |
Payments of financing fees | $ 848,000 | $ 2,982,000 |  |  |
Revolver |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Payments of financing fees | 754,000 | 840,000 |  |  |
Credit facility | Revolver | Credit facilities |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity of credit facility |  |  |  | $ 300,000,000.0 | $ 140,000,000.0
Additional borrowing limit |  |  |  | 50,000,000.0 | 25,000,000.0
Capital lease borrowing limit |  |  |  | 150,000,000.0 | $ 100,000,000.0
Other outstanding debt limit |  |  |  | 20,000,000.0 |
Amount outstanding during period | $ 900,000 | 800,000 |  |  |
Number of financial covenants | convenant | 2 |  |  |  |
Senior leverage ratio, rental revenue | $ 1,800,000 |  |  |  |
Unused borrowing availability under the revolving facility | $ 107,100,000 | $ 107,200,000 |  |  |
Senior leverage ratio | 4.0 |  |  |  | 3.0
Senior leverage ratio, step-up | 0.50 |  |  |  |
Fixed charge ratio | 1.15 |  |  |  | 1.15
Credit facility | Revolver | Minimum | Credit facilities |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Standby fees percentage | 0.35% |  |  |  |
Credit facility | Revolver | Maximum | Credit facilities |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Standby fees percentage | 0.70% |  |  |  |
Credit facility | Letter of Credit | Credit facilities |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity of credit facility |  |  |  | $ 25,000,000.0 | $ 25,000,000.0
Nuna Credit Facility | Credit facilities |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Number of financial covenants | 3 |  |  |  |
Nuna Credit Facility - Operating Loan Facility | Credit facilities |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity of credit facility |  |  | $ 5,000,000.0 |  |
Unused borrowing availability under the revolving facility | $ 5,000,000 |  |  |  |
Nuna Credit Facility - Non-Revolving Reducing Loan Facility | Credit facilities |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity of credit facility | 3,100,000.0 |  |  |  |
Nuna Credit Facility - Equipment Facility | Credit facilities |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity of credit facility | 5,500,000.0 |  |  |  |
Amount outstanding during period | $ 2,900,000 |  |  |  |
Debt instrument, term | 60 months |  |  |  |
Debt Covenant Period, Tranche One | Credit facility | Revolver | Credit facilities |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Senior leverage ratio | 3.50 |  |  |  |
Debt Covenant Period, Tranche Two | Credit facility | Revolver | Credit facilities |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Senior leverage ratio | 3.0 |  |  |  |

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