Co-investments - Summary of Investments (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Co-investments	$ 1,037,270	$ 1,018,010
Total operating and other co-investments, net
Schedule of Equity Method Investments [Line Items]
Co-investments	$ 497,311	358,266
Wesco I, Wesco III, Wesco IV, and Wesco V
Schedule of Equity Method Investments [Line Items]
Weighted average company ownership percentage	51.00%
Co-investments	$ 172,709	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	$ 276,409	152,309
Other
Schedule of Equity Method Investments [Line Items]
Weighted average company ownership percentage	47.00%
Co-investments	$ 48,193	27,635
Total development co-investments
Schedule of Equity Method Investments [Line Items]
Weighted average company ownership percentage	50.00%
Co-investments	$ 9,532	157,433
Total preferred interest co-investments
Schedule of Equity Method Investments [Line Items]
Co-investments	530,427	502,311
Total preferred interest co-investments | Investments in Majority-owned Subsidiaries
Schedule of Equity Method Investments [Line Items]
Co-investments	$ 85,300	$ 81,400