Subsequent Events - Summary of New Public Offering Prices and Applicable Upfront Selling Commissions and Dealer Manager Fees (Detail) - $ / shares		1 Months Ended	3 Months Ended
	Apr. 28, 2020	May 13, 2020	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2018
Subsequent Event [Line Items]
Public Offering Price, Per Share (in dollars per share)			$ 27.26		$ 26.47
Class FA
Subsequent Event [Line Items]
Public Offering Price, Per Share (in dollars per share)			27.61
Class A
Subsequent Event [Line Items]
Public Offering Price, Per Share (in dollars per share)			26.80		26.42
Class T
Subsequent Event [Line Items]
Public Offering Price, Per Share (in dollars per share)			26.90		26.53
Class D
Subsequent Event [Line Items]
Public Offering Price, Per Share (in dollars per share)			26.48		26.18
Class I
Subsequent Event [Line Items]
Public Offering Price, Per Share (in dollars per share)			27.04		$ 26.53
Common Class S- [Member]
Subsequent Event [Line Items]
Public Offering Price, Per Share (in dollars per share)			$ 27.56
Subsequent Event [Member]
Subsequent Event [Line Items]
Public Offering Price, Per Share (in dollars per share)		$ 26.85
Subsequent Event [Member] | Class FA
Subsequent Event [Line Items]
Public Offering Price, Per Share (in dollars per share)		27.15
Subsequent Event [Member] | Class A
Subsequent Event [Line Items]
Public Offering Price, Per Share (in dollars per share)	$ 28.74	26.33
Selling Commissions, Per Share (in dollars per share)	1.72
Dealer Manager Fees, Per Share (in dollars per share)	0.72
Subsequent Event [Member] | Class T
Subsequent Event [Line Items]
Public Offering Price, Per Share (in dollars per share)	27.67	26.36
Selling Commissions, Per Share (in dollars per share)	0.83
Dealer Manager Fees, Per Share (in dollars per share)	0.48
Subsequent Event [Member] | Class D
Subsequent Event [Line Items]
Public Offering Price, Per Share (in dollars per share)	25.94	25.97
Selling Commissions, Per Share (in dollars per share)	0
Dealer Manager Fees, Per Share (in dollars per share)	0
Subsequent Event [Member] | Class I
Subsequent Event [Line Items]
Public Offering Price, Per Share (in dollars per share)	26.55	26.57
Selling Commissions, Per Share (in dollars per share)	0
Dealer Manager Fees, Per Share (in dollars per share)	0
Subsequent Event [Member] | Common Class S- [Member]
Subsequent Event [Line Items]
Public Offering Price, Per Share (in dollars per share)	28.15	$ 136,334.00
Selling Commissions, Per Share (in dollars per share)	0.57
Dealer Manager Fees, Per Share (in dollars per share)	$ 0.42
2019 Private Offering [Member] | Class FA
Subsequent Event [Line Items]
Shares Issued			300,000
Proceeds from Offerings
Subsequent Event [Line Items]
Shares Issued				399,472
Proceeds from Offerings | Class A
Subsequent Event [Line Items]
Shares Issued			120,775	177,162
Proceeds from Offerings | Class T
Subsequent Event [Line Items]
Shares Issued			134,641	24,231
Proceeds from Offerings | Class D
Subsequent Event [Line Items]
Shares Issued			27,873	13,749
Proceeds from Offerings | Class I
Subsequent Event [Line Items]
Shares Issued			181,784	184,330
Proceeds from Offerings | Subsequent Event [Member] | Class A
Subsequent Event [Line Items]
Shares Issued		17,080
Proceeds from Offerings | Subsequent Event [Member] | Class T
Subsequent Event [Line Items]
Shares Issued		78,505
Proceeds from Offerings | Subsequent Event [Member] | Class D
Subsequent Event [Line Items]
Shares Issued		9,258
Proceeds from Offerings | Subsequent Event [Member] | Class I
Subsequent Event [Line Items]
Shares Issued		40,490
Follow On Private Placement [Member] | Class FA
Subsequent Event [Line Items]
Selling Commission on Share Sold Percentage			5.50%
Placement Agent Fee on Share Sold Percentage			3.00%