Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended					0 Months Ended			6 Months Ended			0 Months Ended	12 Months Ended	6 Months Ended
	Dec. 31, 2013 HAWAII Litigation Related to Other Taxes	Dec. 31, 2012 HAWAII Litigation Related to Other Taxes	Dec. 31, 2013 HAWAII Litigation Related to Other Taxes Excise Tax Related Liabilities	Dec. 31, 2013 HAWAII Litigation Related to Other Taxes Penalties	Dec. 31, 2013 HAWAII Litigation Related to Other Taxes Accrued Interest	May 20, 2013 HAWAII 2012 Tax Assessment Litigation Related to Other Taxes	Dec. 09, 2013 HAWAII 2000 through 2012 Litigation Related to Other Taxes	Dec. 09, 2013 HAWAII 2000 through 2012 Litigation Related to Other Taxes Duplicative Assessment	Jun. 30, 2014 Travelocity	Jun. 30, 2014 Travelocity Exercisable Period One	Jun. 30, 2014 Travelocity Exercisable Period Two	May 26, 2014 City of San Francisco	Dec. 31, 2009 City of San Francisco	Jun. 30, 2014 Matters relating to hotel booking practices Minimum LegalMatter	Jun. 30, 2014 Litigation relating to occupancy tax LegalMatter	Dec. 31, 2013 Litigation relating to occupancy tax
Loss Contingencies [Line Items]
Put right held by Sabre, exercisable period									24 months
Put right exercise window										2016	2017
Number of lawsuits filed by cities, counties and states involving hotel occupancy taxes															87
Number of lawsuits currently active															34
Number of lawsuits dismissed to date															37
Number of dismissals based on finding that defendant was not subject to local hotel occupancy tax or the local government lacked standing to pursue claims															23
Reserve for legal contingencies															$ 56	$ 46
Tax assessments						20.5	29.2	9.3
Pay-to-play occupancy and other tax payments	171.0		78.0	41.0	52.0							25.5	48.0
Litigation relating to general excise tax, expense	$ 64	$ 110
Number of Putative class action law suits														30