Condensed Combined Balance Sheets of Limited Liabilities Accounted for under Equity Method (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Equity Method Investments And Joint Ventures [Abstract]
Net property, including construction in progress	$ 32,161	$ 33,111
Other assets	3,684	3,560
Total assets	35,845	36,671
Other liabilities	3,018	3,067
Mortgage notes payable, non-recourse to us	27,404	27,839
Equity	5,423	5,765
Total liabilities and equity	35,845	36,671
Investments in LLCs before amounts included in accrued expenses and other liabilities	5,022	4,671
Amounts included in accrued expenses and other liabilities	(2,247)	(1,895)
Our share of equity in LLCs, net	$ 2,775	$ 2,776