Commitments and Contingencies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Commitments and Contingencies [Line Items]
Redemption of shares | shares	2,000
Redemption of shares in value | $	$ 15,000
Public Offering Distribution Reinvestment Plan [Member] | Class A Common Stock [Member]
Commitments and Contingencies [Line Items]
Purchase price per share	$ 9.81
Public Offering Distribution Reinvestment Plan [Member] | Class T Common Stock [Member]
Commitments and Contingencies [Line Items]
Purchase price per share	9.50
Public Offering Distribution Reinvestment Plan [Member] | Class W Common Stock [Member]
Commitments and Contingencies [Line Items]
Purchase price per share	$ 9.40
Distribution Reinvestment Plan [Member]
Commitments and Contingencies [Line Items]
Sales commissions or dealer manager fees payable | $	$ 0
Amendment, suspension or termination period for distribution reinvestment plan	10 days
Private Offering Share Redemption Program [Member]
Commitments and Contingencies [Line Items]
Maximum weighted average number of shares outstanding percentage	5.00%
Public Offering Share Redemption Program [Member]
Commitments and Contingencies [Line Items]
Maximum weighted average number of shares outstanding percentage	5.00%
Operating Partnership Redemption Rights [Member]
Commitments and Contingencies [Line Items]
Number of shares issuable upon conversion of partnership units | shares	1
Requisite minimum outstanding period for conversion eligibility	1 year
Minimum [Member] | Private Offering Share Redemption Program [Member]
Commitments and Contingencies [Line Items]
Shareholders share holding period	1 year
Asset Campus Housing [Member]
Commitments and Contingencies [Line Items]
Property Managers fee percentage description	we pay a monthly management fee, plus reimbursement of amounts reasonably incurred by ACH in managing the properties, such as employee compensation, marketing costs and certain third-party administrative costs.
Construction management fee description	We also may pay ACH a construction management fee for certain construction management services.
Property management agreements term	1 year
Property management agreements extension term	1 year
Property management notice period	30 days
Senior Living LLC [Member]
Commitments and Contingencies [Line Items]
Property Managers fee percentage description	we pay a monthly management fee plus reimbursement of amounts reasonably incurred in managing the properties, such as employee compensation, marketing costs and certain third-party administrative costs.
Construction management fee description	In certain instances we may pay a construction management fee for certain construction management services.
Property management agreements extension term	1 year
Property management notice period	180 days
Senior Living LLC [Member] | Minimum [Member]
Commitments and Contingencies [Line Items]
Property management agreements term	3 years
Senior Living LLC [Member] | Maximum [Member]
Commitments and Contingencies [Line Items]
Property management agreements term	5 years