Segments - Summarized Consolidated Financial Information by Segment (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Reservation fee percentage	2.00%
Owned Hotels [Member]
Segment Reporting Information [Line Items]
Franchise fee percentage	4.50%
Management fee percentage	2.50%
Revenue from owned hotels	$ 16.7	$ 17.6
Fee charged to owned hotels	$ 32.6	$ 34.4