Investments in Real Estate - Schedule of Purchase Price Allocation of Properties (Detail) $ in Thousands	Jun. 30, 2019 USD ($)
Real Estate Properties [Line Items]
Building and building improvements	$ 3,266,385
Land and land improvements	717,465
Furniture, fixtures and equipment	55,068
In-place lease intangibles	164,797
Above-market lease intangibles	3,596
Below-market lease intangibles	(15,657)
Other	5,342
Total purchase price	4,196,996
Assumed mortgage notes	385,450
Net purchase price	3,811,546
Roman Multifamily Portfolio [Member]
Real Estate Properties [Line Items]
Building and building improvements	714,941
Land and land improvements	110,206
Furniture, fixtures and equipment	8,538
In-place lease intangibles	23,855
Total purchase price	857,540
Assumed mortgage notes	237,981
Net purchase price	619,559
All Other [Member]
Real Estate Properties [Line Items]
Building and building improvements	2,551,444
Land and land improvements	607,259
Furniture, fixtures and equipment	46,530
In-place lease intangibles	140,942
Above-market lease intangibles	3,596
Below-market lease intangibles	(15,657)
Other	5,342
Total purchase price	3,339,456
Assumed mortgage notes	147,469
Net purchase price	$ 3,191,987