Intangible Assets - Amortization Expense of Intangible Assets (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
Total amortization expense	1,020	1,093	1,311
Depreciation And Amortization Expenses [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	667	732	937
Direct lodging expenses [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 353	$ 361	$ 374