Organization and Basis of Presentation - Additional Information (Detail)	6 Months Ended	12 Months Ended
Jun. 30, 2013 Segment Country Brand	Dec. 31, 2011 Company
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of separate independent public companies		2
Reverse stock split of outstanding capital		A one-for-two reverse stock split
Number of countries with localized versions of website	29
Number of other travel brands with websites	20
Number of reportable segment	1

Description of the reverse stock split arrangement. Also provide the retroactive effect given by the reverse split that occurs after the balance sheet date but before the release of financial statements.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 4

-Subparagraph (SAB TOPIC 4.C)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 4

-Section C

Name:	us-gaap_StockholdersEquityReverseStockSplit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration