Supplemental Disclosure of Noncash Financing Activities (HOST HOTELS & RESORTS, L.P.) - Additional Information (Detail) shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2015 USD ($) shares
Other Significant Noncash Transactions [Line Items]
Shares repurchased not settled	$ 22.0
2.5% Exchangeable Senior Debentures Due 2029
Other Significant Noncash Transactions [Line Items]
Exchangeable senior debentures, exchanged	$ 8.7
Debt interest rate	2.50%
Debt converted into shares of Host Inc. common stock | shares	0.7
HOST HOTELS & RESORTS L.P.
Other Significant Noncash Transactions [Line Items]
Shares repurchased not settled	$ 22.0
HOST HOTELS & RESORTS L.P. | 2.5% Exchangeable Senior Debentures Due 2029
Other Significant Noncash Transactions [Line Items]
Exchangeable senior debentures, exchanged	$ 8.7
Debt interest rate	2.50%
Debt converted into shares of Host Inc. common stock | shares	0.7