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Investments in Unconsolidated Subsidiaries - Equity Method Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries $ 1,295,088 $ 1,317,705
Real estate investments (in projects and funds)    
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries 632,050 622,826
Altus Power, Inc.    
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries $ 179,376 $ 219,624
Common stock shares (in shares) 24,556,012 24,554,201
Altus Power, Inc. | Common Class A    
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries $ 134,567 $ 160,093
Shares converted to Class A common stock (in shares) 2,011  
Altus Power, Inc. | Common Class A | Parent Company    
Schedule of Equity Method Investments [Line Items]    
Shares converted to Class A common stock (in shares) 1,811  
Altus Power, Inc. | Alignment Share or Class B Common Shares    
Schedule of Equity Method Investments [Line Items]    
Alignment shares converted (in shares) 201,250  
Other    
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries $ 483,662 475,256
Alignment shares | Alignment Share or Class B Common Shares    
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries $ 44,809 $ 59,530