Organization and Basis of Presentation - Summary of Hotels Owned, Franchised and Number of Associated Rooms (Detail)	Dec. 31, 2017 Hotel Room	Dec. 31, 2016 Hotel Room	Dec. 31, 2015 Hotel Room
Real Estate Properties [Line Items]
Number of hotels | Hotel	902	888	886
Number of rooms | Room	88,400	87,200	87,500
Owned [Member]
Real Estate Properties [Line Items]
Number of hotels | Hotel	316	321	340
Number of rooms | Room	40,400	41,000	43,400
Joint Venture [Member]
Real Estate Properties [Line Items]
Number of hotels | Hotel	1	1	1
Number of rooms | Room	200	200	200
Franchised [Member]
Real Estate Properties [Line Items]
Number of hotels | Hotel	585	566	545
Number of rooms | Room	47,800	46,000	43,900