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Related party transactions (Detail)
$ in Thousands
 12 Months Ended
Dec. 30, 2019
USD ($)
Nov. 28, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jul. 02, 2020
CAD ($)
May 31, 2019
USD ($)
May 31, 2019
CAD ($)
May 24, 2019
USD ($)
May 24, 2019
CAD ($)
Transactions with Third Party [Line Items]                  
Note payable to related party     $ 30,493,000 $ 0          
Interest income     91,448,000 100,886,000          
Fair value loss     (559,701,000) (278,084,000)          
Amount reclassified from AOCI into earnings, net of tax     4,698,000 3,579,000          
Contributions from redeemable non-controlling interests     3,717,000 3,403,000          
Non-controlling interest incurred     (6,955,000) (9,006,000)          
Distribution to redeemable non-controlling interest     951,000 1,848,000          
Non-controlling interests     458,612,000 531,541,000          
San Antonio Water System, Joint Venture                  
Transactions with Third Party [Line Items]                  
Investments in joint venture       1,500,000 $ 1,581        
Ownership interest acquired (percent)         50.00%        
AYES Canada                  
Transactions with Third Party [Line Items]                  
Interest income     14,731,000 25,572,000          
Fair value loss     (20,272,000) 6,649,000          
Non-controlling interests     59,125,000 73,707,000   $ 96,752,000      
Redeemable Non-Controlling Interest                  
Transactions with Third Party [Line Items]                  
Contributions from redeemable non-controlling interests   $ 305,000,000              
Non-controlling interest incurred     12,651,000 16,482,000          
Distribution to redeemable non-controlling interest     12,198,000 18,241,000          
Redeemable Non-Controlling Interest | Secured Credit Facility                  
Transactions with Third Party [Line Items]                  
Debt instrument, term   3 years              
Secured credit facility, maximum borrowing capacity   $ 306,500,000              
Related Party                  
Transactions with Third Party [Line Items]                  
Distribution from interest in noncontrolling interest     16,064,000 26,465,000          
Equity Method Investee                  
Transactions with Third Party [Line Items]                  
Reimbursement of expenses     25,829,000 16,248,000          
Development fees charged to the Company     (26,015,000) (3,924,000)          
Equity Method Investee | Sugar Creek                  
Transactions with Third Party [Line Items]                  
Exchange of notes receivable       21,107,000          
Amount reclassified from AOCI into earnings, before tax       15,765,000          
Amount reclassified from AOCI into earnings, net of tax       11,412,000          
Third party | San Antonio Water System, Joint Venture                  
Transactions with Third Party [Line Items]                  
Investments in joint venture       1,500,000          
Related Party | AWUSA                  
Transactions with Third Party [Line Items]                  
Exchange of notes receivable $ 30,293,000                
Gain (loss) on sale of investments $ 0                
Interest income       6,007,000          
Fair value loss       6,007,000          
Related Party | AYES Canada                  
Transactions with Third Party [Line Items]                  
Non-controlling interests           $ 96,752,000 $ 130,103 $ 96,752,000 $ 130,103
Distribution from interest in noncontrolling interest     $ 16,064,000 $ 26,465,000