Debt - Schedule of Company's Outstanding Debt (Parenthetical) (Detail)			9 Months Ended
	Aug. 31, 2018	Feb. 23, 2018 Loan	Sep. 30, 2018 Property Loan
Utah Freddie Mac Mortgage Loans [Member]
Debt Instrument [Line Items]
Debt instrument, interest payment period		2 years	2 years
Amortization period		30 years	30 years
Number of mortgage loans | Loan		3	3
Number of property acquired | Property			3
Portland Freddie Mac Mortgage Loan [Member]
Debt Instrument [Line Items]
Debt instrument, interest payment period	4 years		4 years
Amortization period	30 years		30 years
Utah Bridge Loan [Member]
Debt Instrument [Line Items]
Commitment fee percentage on loan principal outstanding			0.50%
Portland Initial Bridge Loan [Member]
Debt Instrument [Line Items]
Commitment fee percentage on loan principal outstanding			0.50%