Investments in Real Estate - Schedule of Purchase Price Allocation of Properties (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Real Estate Properties [Line Items]
Building and building improvements	$ 866,342
Land and land improvements	127,732
Furniture, fixtures and equipment	15,902
In-place lease intangibles	26,478
Above-market lease intangibles	10
Below-market lease intangibles	(378)
Total purchase price	1,036,086
Assumed mortgage notes	291,618
Net purchase price	744,468
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	151,401
Land and land improvements	17,526
Furniture, fixtures and equipment	7,364
In-place lease intangibles	2,623
Above-market lease intangibles	10
Below-market lease intangibles	(378)
Total purchase price	178,546
Assumed mortgage notes	53,637
Net purchase price	$ 124,909