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Revenue - Contract balances (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Contract assets $ 19,193 $ 10,673
Contract liabilities 23 4,032
Contract Assets [Roll Forward]    
Balance, beginning of period 10,673 21,572
Transferred to receivables from contract assets recognized at the beginning of the period (10,276) (14,701)
Increases as a result of changes to the estimate of the stage of completion, excluding amounts transferred in the period 14,892 2,043
Increases as a result of work completed, but not yet an unconditional right to consideration 5,736 409
Increases as a result of Nuna acquisition 0 1,350
Decreases due to effect of change in presentation of NL Partnership (1,832) 0
Balance, end of period 19,193 10,673
Contract Liabilities [Roll Forward]    
Balance, beginning of period 4,032 824
Revenue recognized that was included in the contract liability balance at the beginning of the period (4,031) (84)
Increases due to cash received, excluding amounts recognized as revenue during the period 174 1,379
Increases as a result of Nuna acquisition 0 1,913
Decreases due to effect of change in presentation of NL Partnership (152) 0
Balance, end of period 23 4,032
Performance Obligation    
Revenue recognized $ 1,857 $ 2,516