Interest Rate Swap Derivatives Designated as Cash Flow Hedges (Detail)		3 Months Ended		9 Months Ended
		Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 AUD	Sep. 30, 2015 NZD
Derivative [Line Items]
Change in Fair Value Gain (Loss)		$ (8,000,000)	$ 12,000,000	$ 7,000,000	$ 13,000,000
Interest rate swap derivatives
Derivative [Line Items]
Notional amount		350,000,000		$ 350,000,000
Cash Flow Hedging | Interest rate swap derivatives
Derivative [Line Items]
Transaction Date				September 2015
Notional amount		350,000,000		$ 350,000,000
Maturity Date				2025-09
Change in Fair Value Gain (Loss)		$ (10,000,000)			$ (10,000,000)
Cash Flow Hedging | Interest rate swap derivatives | Swap Entered In Connection With Mortgage Loan On Hilton Melbourne South Wharf | Australia
Derivative [Line Items]
Transaction Date	[1]			November 2011
Notional amount | AUD	[1]					AUD 62,000,000
Maturity Date	[1]			2016-11
Swapped Index	[1]			Reuters BBSY
All-in-Rate	[1]	6.70%		6.70%		6.70%	6.70%
Cash Flow Hedging | Interest rate swap derivatives | Swap Entered In Connection With Seven Properties | New Zealand
Derivative [Line Items]
Transaction Date	[2]			February 2011
Notional amount | NZD	[2]						NZD 79,000,000
Maturity Date	[2]			2016-02
Swapped Index	[2]			NZ$ Bank Bill
All-in-Rate	[2]	7.15%		7.15%		7.15%	7.15%

[1] The swap was entered into in connection with the A$86 million ($60 million) mortgage loan on the Hilton Melbourne South Wharf.

[2] The swap was entered into in connection with the NZ$105 million ($67 million) mortgage loan on seven properties in New Zealand.