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Investments in Unconsolidated Subsidiaries - Equity Method Investments (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries $ 1,316,395   $ 1,317,705
Alignment shares, relevant measurement period following merger (in years) 7 years    
Real Estate Investments (in projects and funds)      
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries $ 671,005   622,826
Altus Power, Inc.      
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries $ 167,682   $ 219,624
Common stock shares (in shares) 24,556,012   24,554,201
Altus Power, Inc. | Class A common stock      
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries $ 128,919   $ 160,093
Shares converted to Class A common stock (in shares)   2,011  
Altus Power, Inc. | Class A common stock | Parent Company      
Schedule of Equity Method Investments [Line Items]      
Shares converted to Class A common stock (in shares)   1,811  
Altus Power, Inc. | Alignment Shares      
Schedule of Equity Method Investments [Line Items]      
Alignment shares converted (in shares)   201,250  
Alignment shares | Alignment Shares      
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries 38,763   59,530
Other      
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries $ 477,708   $ 475,256