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Long-term investments - Schedule of Long-Term Investments (Detail) - CAD
CAD in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Equity-method investees CAD 40,479 CAD 64,419
Available-for-sale investment 0 169
Other investments 2,115 2,662
Total long-term investments 84,467 105,433
Notes Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable 41,873 38,183
Notes Receivable | Development loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable 37,710 32,125
Notes Receivable | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable 4,163 6,058
Red Lily I Wind Facility    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Equity-method investees 22,799 23,504
Deerfield Wind Project    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Equity-method investees 0 34,727
Interest in Amherst Wind Project    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Equity-method investees 11,191 558
Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Equity-method investees 6,489 5,630
Variable Interest Entity, Not Primary Beneficiary | Windlectric | Notes Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable CAD 37,710 CAD 29,723