Capital Transactions -Additional Information (Detail) - USD ($)		1 Months Ended		6 Months Ended	11 Months Ended	12 Months Ended
	Mar. 07, 2018	Jul. 31, 2019	Jun. 30, 2019	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2019
Investment Company, Capital Share Transactions [Line Items]
Amount of share requested to be repurchased in excess of proceeds received from its distribution reinvestment plan				$ 400,000
Shares Issued, Including Reinvestments					3,854,515	2,524,449
Average Net Proceeds per Share					$ 25.17	$ 26.93
Issuance of common shares through distribution reinvestment plan					$ 99,836	$ 799,107
Net Proceeds to Company						67,991,333
Class FA Private Offering, Follow-On Class FA Private Offering and Public Offering
Investment Company, Capital Share Transactions [Line Items]
Shares (in shares)					3,850,671
Shares offered	$ 1,000,000,000
Sale of stock offering, minimum requirement	$ 5,000
Distribution Reinvestment Plan [Member]
Investment Company, Capital Share Transactions [Line Items]
Shares offered						100,000,000
Issuance of common shares through distribution reinvestment plan					$ 99,836	$ 799,107
Stock Issued During Period, Shares, Dividend Reinvestment Plan					3,844	30,024
2019 Private Offering, Follow On Private Offering and Public Offering [Member]
Investment Company, Capital Share Transactions [Line Items]
Shares (in shares)						2,494,425
Gross Proceeds						$ 68,426,826
Up-front Selling Commissions and Placement Agent / Dealer Manager Fees						(1,234,600)
Net Proceeds to Company						$ 67,192,226
Class FA
Investment Company, Capital Share Transactions [Line Items]
Shares Issued, Including Reinvestments					3,258,260	1,008,488
Average Net Proceeds per Share					$ 25.00	$ 27.35
Net Proceeds to Company					$ 81,456,500	$ 27,586,447
Class FA | 2019 Private Placement and Follow On Private Placement [Member]
Investment Company, Capital Share Transactions [Line Items]
Shares (in shares)						1,008,488
Gross Proceeds						$ 27,628,371
Net Proceeds to Company						$ 27,586,447
Class FA | 2019 Private Offering [Member]
Investment Company, Capital Share Transactions [Line Items]
Shares (in shares)						1,000,000
Sale of stock offering, minimum requirement			$ 2,000,000
Number of shares offered in 2019 Private Offering		50,000,000
Class FA | Follow On Private Placement [Member]
Investment Company, Capital Share Transactions [Line Items]
Up-front Selling Commissions and Placement Agent / Dealer Manager Fees						$ (41,924)
Share price (usd per share)						$ 30.0327868852459
Class FA | Distribution Reinvestment Plan [Member]
Investment Company, Capital Share Transactions [Line Items]
Issuance of common shares through distribution reinvestment plan					$ 0	$ 0
Stock Issued During Period, Shares, Dividend Reinvestment Plan					0	0
Class A
Investment Company, Capital Share Transactions [Line Items]
Shares Issued, Including Reinvestments					192,388	477,054
Average Net Proceeds per Share					$ 26.33	$ 26.59
Net Proceeds to Company					$ 5,064,779	$ 12,682,767
Class A | Class FA Private Offering, Follow-On Class FA Private Offering and Public Offering
Investment Company, Capital Share Transactions [Line Items]
Shares (in shares)					190,046	463,565
Gross Proceeds					$ 5,435,093	$ 13,294,279
Up-front Selling Commissions and Placement Agent / Dealer Manager Fees					(430,953)	$ (970,592)
Share price (usd per share)						$ 29.28
Net Proceeds to Company					5,004,140	$ 12,323,687
Class A | Distribution Reinvestment Plan [Member]
Investment Company, Capital Share Transactions [Line Items]
Issuance of common shares through distribution reinvestment plan					$ 60,639	$ 359,080
Stock Issued During Period, Shares, Dividend Reinvestment Plan					2,342	13,489
Class T
Investment Company, Capital Share Transactions [Line Items]
Shares Issued, Including Reinvestments					31,452	167,210
Average Net Proceeds per Share					$ 26.09	$ 26.78
Net Proceeds to Company					$ 820,613	$ 4,478,330
Class T | Class FA Private Offering, Follow-On Class FA Private Offering and Public Offering
Investment Company, Capital Share Transactions [Line Items]
Shares (in shares)					31,432	166,277
Gross Proceeds					$ 861,000	$ 4,675,452
Up-front Selling Commissions and Placement Agent / Dealer Manager Fees					(40,897)	$ (222,084)
Share price (usd per share)						$ 28.23
Net Proceeds to Company					820,103	$ 4,453,368
Class T | Distribution Reinvestment Plan [Member]
Investment Company, Capital Share Transactions [Line Items]
Issuance of common shares through distribution reinvestment plan					$ 510	$ 24,962
Stock Issued During Period, Shares, Dividend Reinvestment Plan					20	933
Class D
Investment Company, Capital Share Transactions [Line Items]
Shares Issued, Including Reinvestments					122,889	182,928
Average Net Proceeds per Share					$ 25.95	$ 26.36
Net Proceeds to Company					$ 3,188,533	$ 4,822,008
Class D | Class FA Private Offering, Follow-On Class FA Private Offering and Public Offering
Investment Company, Capital Share Transactions [Line Items]
Shares (in shares)					121,797	176,604
Gross Proceeds					$ 3,160,000	$ 4,655,674
Up-front Selling Commissions and Placement Agent / Dealer Manager Fees					0	$ 0
Share price (usd per share)						$ 26.43
Net Proceeds to Company					3,160,000	$ 4,655,674
Class D | Distribution Reinvestment Plan [Member]
Investment Company, Capital Share Transactions [Line Items]
Issuance of common shares through distribution reinvestment plan					$ 28,533	$ 166,334
Stock Issued During Period, Shares, Dividend Reinvestment Plan					1,092	6,324
Class I
Investment Company, Capital Share Transactions [Line Items]
Shares Issued, Including Reinvestments					249,526	688,769
Average Net Proceeds per Share					$ 26.06	$ 26.75
Net Proceeds to Company					$ 6,502,654	$ 18,421,781
Class I | Class FA Private Offering, Follow-On Class FA Private Offering and Public Offering
Investment Company, Capital Share Transactions [Line Items]
Shares (in shares)					249,136	679,491
Gross Proceeds					$ 6,492,500	$ 18,173,050
Up-front Selling Commissions and Placement Agent / Dealer Manager Fees					0	$ 0
Share price (usd per share)						$ 27.02
Net Proceeds to Company					6,492,500	$ 18,173,050
Class I | Distribution Reinvestment Plan [Member]
Investment Company, Capital Share Transactions [Line Items]
Issuance of common shares through distribution reinvestment plan					$ 10,154	$ 248,731
Stock Issued During Period, Shares, Dividend Reinvestment Plan					390	9,278