Basis of Presentation - Acquisition - Additional Information (Detail) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($) a Room
Business Acquisition [Line Items]
Total Debt	$ 1,469,582	$ 1,341,555
AC Hotel Notes Payable [Member]
Business Acquisition [Line Items]
Total Debt	$ 6,000	$ 6,000
Aloft Hotel National Harbor [Member]
Business Acquisition [Line Items]
Number of room purchased | Room		192
Purchase price of hotel		$ 21,800
Purchase of additional land | a		0.5
Purchase price paid		$ 21,200
Hotel opened date	April 2015