Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 667	$ 732	$ 937
Unfavorable leasehold interests-hotels, restaurants, offices [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 800	$ 1,000	$ 1,100