Subsequent Events - Additional Information (Detail) $ in Thousands				4 Months Ended	6 Months Ended
	Aug. 11, 2017 USD ($) shares	Aug. 03, 2017 USD ($) Key	Jul. 27, 2017 USD ($) Property Unit Key	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) Property shares	Dec. 31, 2016 shares
Subsequent Event [Line Items]
Payments to acquire real estate, exclusive of closing costs | $				$ 0	$ 1,509,640
Purchase of floating-rate CMBS | $				0	$ 300,040
Common stock, shares issued					88,930,421
Proceeds from issuance of common stock | $				$ 0	$ 894,650
Class S Shares [Member]
Subsequent Event [Line Items]
Common stock, shares issued					71,382,151	0
Class I Shares [Member]
Subsequent Event [Line Items]
Common stock, shares issued					17,318,240	20,000
Class D Shares [Member]
Subsequent Event [Line Items]
Common stock, shares issued					216,570	0
Class T Shares [Member]
Subsequent Event [Line Items]
Common stock, shares issued					13,460	0
Multifamily [Member]
Subsequent Event [Line Items]
Number of Properties | Property					13
Hotel [Member]
Subsequent Event [Line Items]
Number of Properties | Property					2
Subsequent Event [Member]
Subsequent Event [Line Items]
Common stock, shares issued	110,469,787
Proceeds from issuance of common stock | $	$ 1,100,000
Subsequent Event [Member] | Class S Shares [Member]
Subsequent Event [Line Items]
Common stock, shares issued	88,132,022
Subsequent Event [Member] | Class I Shares [Member]
Subsequent Event [Line Items]
Common stock, shares issued	20,584,019
Subsequent Event [Member] | Class D Shares [Member]
Subsequent Event [Line Items]
Common stock, shares issued	635,802
Subsequent Event [Member] | Class T Shares [Member]
Subsequent Event [Line Items]
Common stock, shares issued	1,117,944
Subsequent Event [Member] | Commercial Mortgage Backed Securities [Member]
Subsequent Event [Line Items]
Purchase of floating-rate CMBS | $	$ 213,200
Subsequent Event [Member] | NV [Member] | Multifamily [Member]
Subsequent Event [Line Items]
Number of units | Unit			466
Payments to acquire real estate, exclusive of closing costs | $			$ 106,500
Subsequent Event [Member] | Florida [Member] | Hotel [Member]
Subsequent Event [Line Items]
Payments to acquire real estate, exclusive of closing costs | $			$ 58,400
Number of Properties | Property			4
Number of keys in service hotels | Key			469
Subsequent Event [Member] | Georgia [Member] | Hotel [Member] | Hyatt House Atlanta Downtown [Member]
Subsequent Event [Line Items]
Payments to acquire real estate, exclusive of closing costs | $		$ 35,000
Number of keys in service hotels | Key		150