Organization and Basis of Presentation - Summary of Number of Owned and Joint Venture Hotels (Detail)	Sep. 30, 2018 Hotel Room	Dec. 31, 2017 Hotel Room
Real Estate Properties [Line Items]
Number of hotels | Hotel	315	317
Number of rooms | Room	40,400	40,600
Owned [Member]
Real Estate Properties [Line Items]
Number of hotels | Hotel	314	316
Number of rooms | Room	40,200	40,400
Joint Venture [Member]
Real Estate Properties [Line Items]
Number of hotels | Hotel	1	1
Number of rooms | Room	200	200