Organization and Basis of Presentation - Summary of Hotels Owned, Franchised and Number of Associated Rooms (Detail)	Mar. 31, 2017 Hotel Room	Mar. 31, 2016 Hotel Room
Real Estate Properties [Line Items]
Number of hotels | Hotel	889	886
Number of rooms | Room	87,400	87,700
Owned [Member]
Real Estate Properties [Line Items]
Number of hotels | Hotel	318	340
Number of rooms | Room	40,700	43,400
Joint Venture [Member]
Real Estate Properties [Line Items]
Number of hotels | Hotel	1	1
Number of rooms | Room	200	200
Franchised [Member]
Real Estate Properties [Line Items]
Number of hotels | Hotel	570	545
Number of rooms | Room	46,500	44,100