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Long-term investments - Additional Information (Detail)
 12 Months Ended
Nov. 28, 2018
USD ($)
Nov. 27, 2018
USD ($)
$ / shares
Mar. 09, 2018
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
shareholder
MW
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
km
Jun. 30, 2018
USD ($)
May 10, 2017
USD ($)
Mar. 14, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Dividend income       $ 41,079,000 $ 1,167,000        
Income (loss) from equity method investments       (1,609,000) (2,742,000)        
Amount drawn under credit facility $ 305,000,000 $ 305,000,000              
Holdback amount on credit facility   $ 40,000,000              
Change in value of investment carried at fair value (note 8(a))       (137,957,000) 0        
Equity-method investees       $ 30,492,000 32,267,000        
Red Lily I Project, wind energy facility, capacity (megawatt) | MW       26.4          
Property, plant and equipment       $ 6,393,558,000 6,304,897,000        
Development loans | Notes Receivable                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Notes receivable from equity investees (e)       101,416,000 30,060,000        
Atlantica Yield                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Dividend income       $ 39,263,000          
Equity interest   16.50% 25.00% 41.50%          
Equity interest, share price (in usd per share) | $ / shares   $ 20.90 $ 24.25            
Contingent payment (in usd per share) | $ / shares     $ 0.60            
Contributions of capital   $ 345,000,000 $ 607,567,000            
Fair value loss     $ 139,864,000 $ 137,957,000          
Change in value of investment carried at fair value (note 8(a))       1,907,000          
Abengoa-Algonquin Global Energy Solution B.V.                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Income (loss) from equity method investments       3,005,000          
Equity-method investees             $ 5,000,000    
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount       7,509,000          
Letters of credit, issued       3,750,000          
Abengoa-Algonquin Global Energy Solution B.V. | Notes Receivable                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Notes receivable from equity investees (e)       4,940,000          
75% Interest in Red Lily I Partnership                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Income (loss) from equity method investments       $ (1,637,000) (2,139,000)        
75% Interest in Red Lily I Partnership | Maximum                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Option to subscribe equity interest in partnership, percentage       75.00%          
50% interest in Odell and Deerfield Wind Projects | Development loans                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Letter of credit fee percent       2.00%          
50% Interest in Deerfield Wind Project                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Equity interest       50.00%          
Project power capacity (megawatt) | MW       149          
Interest in Amherst Wind Project                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Income (loss) from equity method investments       $ 1,714,000          
Equity-method investees       7,655,000 8,921,000        
Interest capitalized on non-regulated property       739,000 1,115,000        
Property, plant and equipment       308,825,000          
Long-term debt       190,910,000 106,628,000        
Deerfield SponsorCo                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Equity interest                 50.00%
Tax equity funding received               $ 166,595,000  
Amherst and Deerfield Wind Projects                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Accrued interest revenue       $ 6,144          
Variable Interest Entity, Not Primary Beneficiary                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Number of shareholders with joint control | shareholder       2          
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount       $ 192,052,000          
Variable Interest Entity, Not Primary Beneficiary | Windlectric                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Value of guarantee obligations recognized       1,637,000 $ 1,952,000        
Variable Interest Entity, Not Primary Beneficiary | Windlectric | Notes Receivable                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Notes receivable from equity investees (e)       $ 96,477,000          
Windlectric                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Project power capacity (megawatt) | MW       74.1          
AAGES B.V Secured Credit Facility                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Duration of credit facility 3 years                
Secured credit facility $ 306,500,000                
Subsequent Event | Abengoa-Algonquin Global Energy Solution B.V.                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Amount repaid under credit support facility           $ 1,750,000      
Subsequent Event | Wataynikaneyap Power Transmission                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Ownership percentage of noncontrolling interest           9.80%      
Distance of transmission line | km           1,800