Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017 USD ($) facility segment	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Accounting Policies [Abstract]
Number of independent living facilities operated | facility	3
Accumulated amortization of deferred financing costs	$ 4,800,000		$ 4,200,000
Reserve against receivables	0		0
Stock-based compensation expense	536,000	$ 431,000
Restricted cash	$ 0		$ 0
Number of reportable segments | segment	1
Pristine Master Lease [Member]
Other Commitments [Line Items]
Property taxes and franchise permit fees receivable	$ 2,200,000
Lease Agreements [Member]
Other Commitments [Line Items]
Remaining contractual payments	$ 400,000