Co-investments - Summary of Investments (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Co-investments	$ 1,052,824	$ 1,018,010
Distributions in excess of investments in co-investments	29,037	0
Total operating and other co-investments, net
Schedule of Equity Method Investments [Line Items]
Co-investments	$ 470,806	358,266
Wesco I (2), Wesco III, Wesco IV, Wesco V, and Wesco VI
Schedule of Equity Method Investments [Line Items]
Weighted average company ownership percentage	52.00%
Co-investments	$ 138,745	178,322
BEXAEW, BEX II, BEX III, BEX IV, and 500 Folsom
Schedule of Equity Method Investments [Line Items]
Weighted average company ownership percentage	50.00%
Co-investments	$ 273,557	152,309
Other
Schedule of Equity Method Investments [Line Items]
Weighted average company ownership percentage	46.00%
Co-investments	$ 58,504	27,635
Total development co-investments
Schedule of Equity Method Investments [Line Items]
Weighted average company ownership percentage	50.00%
Co-investments	$ 9,965	157,433
Total preferred interest co-investments
Schedule of Equity Method Investments [Line Items]
Co-investments	572,053	502,311
Total preferred interest co-investments | Investments in Majority-owned Subsidiaries
Schedule of Equity Method Investments [Line Items]
Co-investments	$ 87,500	$ 81,400