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Long-term investments - Additional Information (Detail)
$ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
Dec. 30, 2019
USD ($)
Apr. 16, 2019
USD ($)
MW
Nov. 28, 2018
USD ($)
May 31, 2019
USD ($)
May 31, 2019
CAD ($)
Jun. 30, 2019
shares
Dec. 31, 2019
USD ($)
MW
wind_project
shares
Dec. 31, 2019
CAD ($)
MW
wind_project
shares
Dec. 31, 2018
USD ($)
May 24, 2019
USD ($)
May 24, 2019
CAD ($)
May 01, 2019
USD ($)
mi
Apr. 15, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Equity method investments             $ 83,770,000   $ 29,588,000        
Amount drawn under credit facility     $ 305,000,000                    
Non-controlling interest attributable to subsidiary             16,482,000   2,622,000        
Distribution from interest in noncontrolling interest             26,465,000 $ 34,373          
Fair value loss             278,084,000   (137,957,000)        
Investments carried at fair value             1,294,147,000   814,530,000        
Capital contributed to joint venture $ 1,500,000                        
Dividend and interest income from investments             100,886,000   39,263,000        
Noncontrolling interest in partnerships and joint ventures             83,770,000   29,588,000        
Investments in VIEs             $ 59,091,000   9,581,000        
Number of wind projects | wind_project             3 3          
Fair value of support provided             $ 9,493,000   1,682,000        
Income (loss) from equity method investments             $ 9,108,000   $ 3,082,000        
Notes receivable, weighted average interest rate (percent)             7.66%   9.90%        
AWUSA VR Holding LLC                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Equity interest                       20.00%  
Distance of water pipeline | mi                       140  
Note payable 13,293,000                        
San Antonio Water System                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Fair value loss             $ (6,007,000)   $ 0        
Investments carried at fair value             27,072,000   0        
Additional deferred credits related to investment in San Antonio Water System             5,000,000            
Dividend and interest income from investments             $ 6,007,000   0        
Atlantica Yield Energy Solutions Canada, Inc                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Equity method investment, treasury shares purchased (shares) | shares             1,384,402 1,384,402          
Payment to acquire equity method investment             $ 30,000,000            
Share received pursuant to prepayment (shares) | shares             2,000,000 2,000,000          
Equity method investment, prepayment             $ 53,750,000            
Option to exchange shares | shares           3,500,000              
AYES Canada                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Non-controlling interest attributable to subsidiary       $ 96,752,000     73,707,000            
Dividend income             25,572            
Fair value loss             (6,649,000)   0        
Investments carried at fair value             88,494,000   0        
Dividend and interest income from investments             $ 25,572,000   $ 0        
Atlantica                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Equity interest             44.20%   41.50%        
Equity method investments                 $ 952,567,000        
Holdback amount on credit facility                 40,000,000        
Holdback settled in 2019             $ (29,100,000)            
Fair value loss             290,740,000   (137,957,000)        
Investments carried at fair value             1,178,581,000   814,530,000        
Dividend and interest income from investments             $ 69,307,000   $ 39,263,000        
Atlantica | Maximum                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Equity interest             48.50%            
Maverick                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Wind power capacity (megawatt) | MW             490 490          
Sugar Creek                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Wind power capacity (megawatt) | MW             202 202          
75% Interest in Red Lily I Partnership                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Equity interest             75.00%            
Wind power capacity (megawatt) | MW             26.4 26.4          
Other Development Projects                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Equity interest             50.00%            
Windlectric                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Equity interest                         50.00%
Equity method investments                   $ 91,918,000 $ 123,603    
Non-controlling interest attributable to subsidiary         $ 130,103                
Non-controlling interest calculated using the HLBV method             $ 0            
Wind power capacity (megawatt) | MW   75                      
Development loan   $ 316,786,000                      
Altavista                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Solar power capacity (megawatt ac) | MW             80 80          
Southern Missouri Wind Projects                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Wind power capacity (megawatt) | MW             150 150          
Number of wind projects | wind_project             2 2          
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                    
Secured Loan | AWUSA VR Holding LLC                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Equity method investments                       $ 17,000,000  
Atlantica | Windlectric                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Equity method investments                   $ 4,834,000 $ 6,500    
Affiliated Entity                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Exchange of note receivable $ 30,293                        
Windlectric                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Total purchase price   6,362,000                      
Property, plant and equipment   311,175,000                      
Deferred income tax assets, net   3,015,000                      
Working capital   14,280,000                      
Liabilities   $ 1,600,000