Co-investments - Summary of Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Co-investments	$ 962,625	$ 1,018,010
Total operating and other co-investments, net
Schedule of Equity Method Investments [Line Items]
Co-investments	$ 501,488	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	$ 178,071	178,322
BEXAEW, BEX II, BEX III, BEX IV, and 500 Folsom (2)
Schedule of Equity Method Investments [Line Items]
Weighted average company ownership percentage	50.00%
Co-investments	$ 294,737	152,309
Other
Schedule of Equity Method Investments [Line Items]
Weighted average company ownership percentage	47.00%
Co-investments	$ 28,680	27,635
Total predevelopment and development co-investments
Schedule of Equity Method Investments [Line Items]
Weighted average company ownership percentage	50.00%
Co-investments	$ 22,237	157,433
Total preferred interest co-investments
Schedule of Equity Method Investments [Line Items]
Co-investments	438,900	502,311
Total preferred interest co-investments | Investments in Majority-owned Subsidiaries
Schedule of Equity Method Investments [Line Items]
Co-investments	$ 83,300	$ 81,400