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Long-term investments (Detail)
CAD in Thousands, $ in Thousands
Dec. 31, 2015
CAD
Dec. 31, 2015
USD ($)
Oct. 19, 2015
Dec. 31, 2014
CAD
Nov. 30, 2014
Nov. 14, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Equity-method investees CAD 52,473     CAD 6,598    
Available-for-sale investment 2,946     137    
Notes receivable 119,383     39,510    
Total long-term investments 174,802     46,245    
Less current portion 0     (2,966)    
Total long-term investments 174,802     43,279    
Notes Receivable | Development loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable 96,924     17,582    
Notes Receivable | Red Lily Senior loan, interest at 6.31%            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable CAD 11,588     11,588    
Note receivable interest rate 6.31% 6.31%        
Notes Receivable | Red Lily Subordinated loan, interest at 12.5%            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable CAD 6,565     6,565    
Note receivable interest rate 12.50% 12.50%        
Notes Receivable | Other            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable CAD 4,306     3,775    
50% interest in Odell Wind Project            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Equity-method investees CAD 42,287     2,267    
Equity interest 50.00% 50.00%       50.00%
50% interest in Odell Wind Project | Notes Receivable | Development loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable | $   $ 62,751        
50% Interest in Deerfield Wind Project            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Equity-method investees CAD 2,240     0    
Equity interest 50.00% 50.00% 50.00%      
50% Interest in Deerfield Wind Project | Notes Receivable | Development loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable | $   $ 7,281        
Interest in Natural Gas Pipeline Development            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Equity-method investees CAD 5,623     1,063    
Equity interest         2.50%  
Other            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Equity-method investees CAD 2,323     CAD 3,268