Other Assets and Other Liabilities - Summary of Components of Accounts Payable, Accrued Expenses, and Other Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Payables And Accruals [Abstract]
Subscriptions received in advance	$ 560,444	$ 166,542
Payable for real estate-related securities and loans	185,074
Real estate taxes payable	129,296	56,555
Intangible liabilities, net	130,368	55,709
Accounts payable and accrued expenses	107,269	53,247
Right of use lease liability - operating leases	79,271
Right of use lease liability - financing leases	56,514	4,300
Tenant security deposits	45,099	23,493
Distribution payable	44,741	21,360
Prepaid rental income	38,760	29,112
Accrued interest expense	31,954	24,432
Other	46,885	29,648
Total	$ 1,455,675	$ 464,398