Dispositions - Additional Information (Detail) NZD in Millions, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2016 NZD	Sep. 30, 2016 USD ($) Hotel	Sep. 30, 2015 USD ($)	Dec. 31, 2015 Hotel
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sales of assets, net | $			$ 467	$ 183
Number of hotels sold | Hotel			10		8
Ibis Christchurch and Novotel Christchurch
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sales of assets, net	$ 31	NZD 43