Subsequent Events - Summary of Company's Initial Public Offerings (Detail) - USD ($)	Aug. 02, 2017	Jun. 30, 2017
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		$ 2,513,644
Number of shares issued		237,805
Primary Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		$ 2,000,000
Number of shares issued		221,349
DRIP
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		$ 13,644
Number of shares issued		1,510
Private Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		$ 500,000
Number of shares issued		14,000
Stock dividends
Subsidiary, Sale of Stock [Line Items]
Number of shares issued		946
Class T
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		$ 62,300
Number of shares issued		7,026
Class T | Primary Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		$ 0
Number of shares issued		0
Class T | DRIP
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		$ 0
Number of shares issued		0
Class T | Private Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		$ 62,300
Number of shares issued		7,000
Class T | Stock dividends
Subsidiary, Sale of Stock [Line Items]
Number of shares issued		26
Class W
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		$ 0
Number of shares issued		0
Class W | Primary Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		$ 0
Number of shares issued		0
Class W | DRIP
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		$ 0
Number of shares issued		0
Class W | Private Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		$ 0
Number of shares issued		0
Class W | Stock dividends
Subsidiary, Sale of Stock [Line Items]
Number of shares issued		0
Class I
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		$ 2,075,944
Number of shares issued		230,779
Class I | Primary Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		$ 2,000,000
Number of shares issued		221,349
Class I | DRIP
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		$ 13,644
Number of shares issued		1,510
Class I | Private Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		$ 62,300
Number of shares issued		7,000
Class I | Stock dividends
Subsidiary, Sale of Stock [Line Items]
Number of shares issued		920
Notes to Stockholders
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		$ 375,400
Notes to Stockholders | Primary Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		0
Notes to Stockholders | DRIP
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		0
Notes to Stockholders | Private Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised		$ 375,400
Subsequent Event
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	$ 2,527,506
Number of shares issued	240,156
Subsequent Event | Primary Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	$ 2,000,000
Number of shares issued	221,349
Subsequent Event | DRIP
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	$ 27,506
Number of shares issued	2,897
Subsequent Event | Private Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	$ 500,000
Number of shares issued	14,000
Subsequent Event | Stock dividends
Subsidiary, Sale of Stock [Line Items]
Number of shares issued	1,910
Subsequent Event | Class T
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	$ 62,300
Number of shares issued	7,052
Subsequent Event | Class T | Primary Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	$ 0
Number of shares issued	0
Subsequent Event | Class T | DRIP
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	$ 0
Number of shares issued	0
Subsequent Event | Class T | Private Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	$ 62,300
Number of shares issued	7,000
Subsequent Event | Class T | Stock dividends
Subsidiary, Sale of Stock [Line Items]
Number of shares issued	52
Subsequent Event | Class W
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	$ 0
Number of shares issued	0
Subsequent Event | Class W | Primary Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	$ 0
Number of shares issued	0
Subsequent Event | Class W | DRIP
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	$ 0
Number of shares issued	0
Subsequent Event | Class W | Private Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	$ 0
Number of shares issued	0
Subsequent Event | Class W | Stock dividends
Subsidiary, Sale of Stock [Line Items]
Number of shares issued	0
Subsequent Event | Class I
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	$ 2,089,806
Number of shares issued	233,104
Subsequent Event | Class I | Primary Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	$ 2,000,000
Number of shares issued	221,349
Subsequent Event | Class I | DRIP
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	$ 27,506
Number of shares issued	2,897
Subsequent Event | Class I | Private Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	$ 62,300
Number of shares issued	7,000
Subsequent Event | Class I | Stock dividends
Subsidiary, Sale of Stock [Line Items]
Number of shares issued	1,858
Subsequent Event | Notes to Stockholders
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	$ 375,400
Subsequent Event | Notes to Stockholders | Primary Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	0
Subsequent Event | Notes to Stockholders | DRIP
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	0
Subsequent Event | Notes to Stockholders | Private Offering
Subsidiary, Sale of Stock [Line Items]
Amount of gross proceeds raised	$ 375,400