Preferred Equity in our Operating Partnership - Additional Information (Detail) - USD ($)		1 Months Ended	6 Months Ended		12 Months Ended
	Jun. 28, 2017	Oct. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Preferred Units [Line Items]
Distribution description			The holders of Preferred Units receive distributions at a rate of 9.0% per annum (the “Pay Rate”), payable monthly and calculated on an actual/360 day basis. Accumulated but unpaid distributions, if any, accrue at the Pay Rate. As of June 30, 2019 and December 31, 2018, the accumulated unpaid distributions included in distributions payable were approximately $0.8 million and $0.3 million, respectively. The preferred units of limited partnership interests in our Operating Partnership rank senior to all classes or series of partnership interests in our Operating Partnership and therefore, any cash we have to pay distributions otherwise may be used to pay distributions to the holder of such preferred units first.
Distribution rate			9.00%
Accumulated unpaid distributions			$ 800,000		$ 300,000
Repayments of bridge loan			1,000,000	$ 6,703,715
Power 5 Conference Student Housing [Member]
Preferred Units [Line Items]
Proceeds from issuance of preferred units in operating partnership		$ 800,000
SAM Preferred Investor Limited Liability Company [Member]
Preferred Units [Line Items]
Preferred investor investment in operating partnership					$ 10,100,000
Preferred investor received					402,550
Additional preferred units					4,025
Percentage of first tranche of investment					1.00%
Preferred units outstanding value			$ 10,200,000		$ 10,200,000
SAM Preferred Investor Limited Liability Company [Member] | Power 5 Conference Student Housing [Member]
Preferred Units [Line Items]
Proceeds from issuance of preferred units in operating partnership					800,000
SAM Preferred Investor Limited Liability Company [Member] | Utah Bridge Loan [Member]
Preferred Units [Line Items]
Repayments of bridge loan					5,900,000
SAM Preferred Investor Limited Liability Company [Member] | Portland Property [Member]
Preferred Units [Line Items]
Closing of property					$ 3,400,000
SAM Preferred Investor Limited Liability Company [Member] | Unit Purchase Agreement [Member]
Preferred Units [Line Items]
Liquidation preference per Preferred Unit	$ 25.00
SAM Preferred Investor Limited Liability Company [Member] | Unit Purchase Agreement [Member] | Maximum [Member]
Preferred Units [Line Items]
Redeemable preferred equity	$ 12,000,000
Preferred investor received	480,000