Organization and Business Purpose - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2017 USD ($) Investment Position Segment shares	Dec. 31, 2016 shares
Organization and business activities.
Date of formation	Nov. 16, 2015
Common stock, shares authorized, amount | $	$ 5,000,000,000
Common stock, shares issued	88,930,421
Number of real estate investments | Investment	10
Number of reportable segments | Segment	5
Commercial Mortgage Backed Securities [Member]
Organization and business activities.
Number of positions | Position	12
Class S Shares [Member]
Organization and business activities.
Common stock, shares issued	71,382,151	0
Class I Shares [Member]
Organization and business activities.
Common stock, shares issued	17,318,240	20,000
Class T Shares [Member]
Organization and business activities.
Common stock, shares issued	13,460	0
Class D Shares [Member]
Organization and business activities.
Common stock, shares issued	216,570	0
IPO [Member]
Organization and business activities.
Common stock, shares authorized, amount | $	$ 4,000,000,000
Distribution Reinvestment Plan [Member]
Organization and business activities.
Common stock, shares authorized, amount | $	$ 1,000,000,000