Organization and Basis of Presentation - Additional Information (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2013 Segment Country Brand	Dec. 31, 2011 Company
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of separate independent public companies		2
Number of countries with localized versions of website	33
Number of other travel brands with websites	20
Number of reportable segment	1