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Long-term investments - Additional Information (Detail)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 09, 2020
USD ($)
$ / instrument
Oct. 21, 2020
USD ($)
May 31, 2020
shares
Dec. 31, 2020
USD ($)
$ / MWh
turbine
windProject
MWac
Dec. 31, 2019
USD ($)
Mar. 31, 2021
USD ($)
Mar. 04, 2021
USD ($)
windProject
Jan. 07, 2021
USD ($)
shares
Dec. 31, 2020
CAD ($)
$ / MWh
windProject
MWac
Jul. 02, 2020
CAD ($)
Dec. 30, 2019
USD ($)
May 31, 2019
USD ($)
May 31, 2019
CAD ($)
May 24, 2019
USD ($)
May 24, 2019
CAD ($)
Schedule of Equity Method Investments [Line Items]                              
Equity method investments       $ 186,452,000 $ 82,111,000                    
Non-controlling interest held by related party       458,612,000 531,541,000                    
Non-controlling interest calculated using the HLBV method of accounting       (67,286,000) (62,416,000)                    
Interest income       91,448,000 100,886,000                    
Fair value loss       559,701,000 278,084,000                    
Investments carried at fair value       1,837,429,000 1,294,147,000                    
Noncontrolling interest in partnerships and joint ventures       186,452,000 82,111,000                    
Fair value of support provided       12,273,000 9,446,000                    
Obligation to provide cash advances under purchase option agreement       2,124,296,000                      
Short-term debt       $ 194,478,000                      
San Antonio Water System                              
Schedule of Equity Method Investments [Line Items]                              
Equity interest       20.00%         20.00%            
Interest income       $ 2,113,000 6,007,000                    
Fair value loss       117,000 (6,007,000)                    
Investments carried at fair value       $ 0 27,072,000                    
San Antonio Water System, Joint Venture                              
Schedule of Equity Method Investments [Line Items]                              
Investments in joint venture         1,500,000         $ 1,581          
Ownership interest acquired (percent)                   50.00%          
San Antonio Water System, Joint Venture | Third party                              
Schedule of Equity Method Investments [Line Items]                              
Investments in joint venture         1,500,000                    
AWUSA | AIP                              
Schedule of Equity Method Investments [Line Items]                              
Interest income         6,007,000                    
Fair value loss         (6,007,000)                    
Exchange of notes receivable                     $ 30,293,000        
Atlantica                              
Schedule of Equity Method Investments [Line Items]                              
Equity interest       44.20%         44.20%            
Equity method investments       $ 1,036,414,000                      
Interest income       74,604,000 69,307,000                    
Fair value loss       519,297,000 290,740,000                    
Investments carried at fair value       $ 1,706,900,000 1,178,581,000                    
Atlantica | Maximum                              
Schedule of Equity Method Investments [Line Items]                              
Equity interest       48.50%         48.50%            
Atlantica | Subscription Share Purchase Agreement                              
Schedule of Equity Method Investments [Line Items]                              
Subscription purchase agreement, share price (in USD) | $ / instrument 33.00                            
Derivative financial instruments, liabilities $ 20,015,000                            
Windlectric                              
Schedule of Equity Method Investments [Line Items]                              
Equity method investments                           $ 91,918,000 $ 123,603
Windlectric | AYES Canada                              
Schedule of Equity Method Investments [Line Items]                              
Equity method investments                           4,834,000 6,500
AYES Canada                              
Schedule of Equity Method Investments [Line Items]                              
Non-controlling interest held by related party       $ 59,125,000 73,707,000             $ 96,752,000      
Option to exchange shares | shares     3,500,000                        
Interest income       14,731,000 25,572,000                    
Fair value loss       20,272,000 (6,649,000)                    
Investments carried at fair value       110,514,000 88,494,000                    
AYES Canada | AIP                              
Schedule of Equity Method Investments [Line Items]                              
Non-controlling interest held by related party                       $ 96,752,000 $ 130,103 $ 96,752,000 $ 130,103
Non-controlling interest calculated using the HLBV method of accounting       0 0                    
Distribution from interest in noncontrolling interest       $ 16,064,000 $ 26,465,000                    
Texas Wind Farms | Forecast                              
Schedule of Equity Method Investments [Line Items]                              
Equity method investments           $ 103,642,000                  
Red Lily I                              
Schedule of Equity Method Investments [Line Items]                              
Equity interest       75.00%         75.00%            
Wind facility capacity (megawatt AC) | $ / MWh       26.4         26.4            
Other Development Projects                              
Schedule of Equity Method Investments [Line Items]                              
Equity interest       50.00%         50.00%            
Option to acquire remaining equity interest (percent)       50.00%         50.00%            
Sugar Creek                              
Schedule of Equity Method Investments [Line Items]                              
Wind facility capacity (megawatt ac) | MWac       202         202            
Maverick                              
Schedule of Equity Method Investments [Line Items]                              
Wind facility capacity (megawatt ac) | MWac       492         492            
Sugar Creek and North Fork Ridge                              
Schedule of Equity Method Investments [Line Items]                              
Number of turbines commissioned | turbine       111                      
Total number of turbines | turbine       127                      
Altavista                              
Schedule of Equity Method Investments [Line Items]                              
Solar power capacity (megawatt ac) | MWac       80                      
Blue Hill                              
Schedule of Equity Method Investments [Line Items]                              
Wind facility capacity (megawatt ac) | MWac       175         175            
Blue Hill | Joint Venture                              
Schedule of Equity Method Investments [Line Items]                              
Equity interest       50.00%         50.00%            
Investments in joint venture       $ 20,029,000         $ 27,205            
Southwestern Missouri Wind Projects                              
Schedule of Equity Method Investments [Line Items]                              
Number of wind development projects | windProject       2         2            
Wind facility capacity (megawatt ac) | MWac       150         150            
Abengoa Investments                              
Schedule of Equity Method Investments [Line Items]                              
Payment for option to purchase investments   $ 1,500,000                          
Term of option to purchase investment   12 months                          
Obligation to provide cash advances under purchase option agreement   $ 7,233,000                          
Subsequent Event | Atlantica                              
Schedule of Equity Method Investments [Line Items]                              
Equity method investments               $ 132,688,000              
Equity method investment, shares acquired (shares) | shares               4,020,860              
Subsequent Event | Texas Wind Farms                              
Schedule of Equity Method Investments [Line Items]                              
Equity interest             51.00%                
Equity method investments             $ 227,556,000                
Number of wind development projects acquired | windProject             3                
Number of wind development projects | windProject             4                
Subsequent Event | Sugar Creek                              
Schedule of Equity Method Investments [Line Items]                              
Ownership interest acquired (percent)             50.00%                
Subsequent Event | Maverick                              
Schedule of Equity Method Investments [Line Items]                              
Ownership interest acquired (percent)             50.00%                
Subsequent Event | Sugar Creek and Maverick                              
Schedule of Equity Method Investments [Line Items]                              
Investments in joint venture             $ 43,796,000                
Subsequent Event | Sugar Creek and Maverick | Property, Plant and Equipment                              
Schedule of Equity Method Investments [Line Items]                              
Investments in joint venture             1,009,709,000                
Subsequent Event | Sugar Creek and Maverick | Construction Loan Payable                              
Schedule of Equity Method Investments [Line Items]                              
Short-term debt             $ 837,026,000                
Subsequent Event | North Fork Ridge                              
Schedule of Equity Method Investments [Line Items]                              
Ownership interest acquired (percent)             50.00%