STOCKHOLDERS' EQUITY - Additional Information (Detail)		3 Months Ended			12 Months Ended
	Oct. 02, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 05, 2019 USD ($)	Dec. 01, 2016 USD ($) Investor $ / shares shares	Feb. 18, 2016 USD ($)
Stockholders Equity [Line Items]
Offering costs					$ 18,847,000	$ 22,072,000	$ 1,305,000
IPO
Stockholders Equity [Line Items]
Offering amount of stock										$ 2,000,000,000
Total amount of common stock remaining available for sale $					1,900,000,000
Amount remaining available for sale through distribution reinvestment plan					496,900,000
Follow-on Public Offering
Stockholders Equity [Line Items]
Offering amount of stock								$ 2,000,000,000
Primary Offering
Stockholders Equity [Line Items]
Offering amount of stock								1,500,000,000
DRIP Offering
Stockholders Equity [Line Items]
Offering amount of stock								$ 500,000,000
Private Offering
Stockholders Equity [Line Items]
Number of investors in the Private Offering | Investor									125
Common stock value									$ 124,600
Offering costs					24,694
Class A | Private Offering
Stockholders Equity [Line Items]
Number of shares of common stock issued per investor in the Private Offering | shares									56
Offering price of common stock per share, primary shares (in dollars per share) | $ / shares									$ 8.90
Number of common stock issued in the Private Offering (in share) | shares									7,000
Class T
Stockholders Equity [Line Items]
Common stock value					$ 452,000	198,000
Redemption percentage of common stock that's been outstanding more than one year but less than two years					97.50%
Class T | Private Offering
Stockholders Equity [Line Items]
Number of shares of common stock issued per investor in the Private Offering | shares									56
Offering price of common stock per share, primary shares (in dollars per share) | $ / shares									$ 8.90
Number of common stock issued in the Private Offering (in share) | shares									7,000
Stock Dividends
Stockholders Equity [Line Items]
Special daily stock dividends, shares		0.0000410959	0.0000410959	0.0000410959
Class W
Stockholders Equity [Line Items]
Common stock value					$ 27,000	$ 2,000
Dividend shares issued per share (in shares)	50
Common Stock
Stockholders Equity [Line Items]
Redemption percentage of common stock that's been outstanding less than one year					95.00%