Fair Value Disclosures - Schedule of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value
Fair Value of Financial Instruments [Line Items]
Notes receivable from Preferred and Common Operating Partnership unit holders	$ 119,976	$ 116,184
Fixed rate notes payable	3,613,096	3,511,151
Exchangeable senior notes	620,281	673,831
Carrying Value
Fair Value of Financial Instruments [Line Items]
Notes receivable from Preferred and Common Operating Partnership unit holders	118,524	118,524
Fixed rate notes payable	3,454,701	3,417,928
Exchangeable senior notes	$ 575,000	$ 575,000