Earnings Per Common Share (Unit) - Additional Information (Detail) (HOST HOTELS & RESORTS, INC.) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015
HOST HOTELS & RESORTS, INC.
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
OP units outstanding	9.2
Number of common shares that would be outstanding if OP units were converted	9.4

The number of units or equivalent units outstanding for all classes.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-Subparagraph (SAB TOPIC 4.F)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

Name:	us-gaap_UnitsOfPartnershipInterestAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant