COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended				1 Months Ended		3 Months Ended
	Mar. 31, 2014 Litigation related to travel transaction taxes [Member] Cases	Dec. 31, 2013 Litigation related to travel transaction taxes [Member]	Dec. 31, 2012 Litigation related to alleged anti-trust violations [Member] Cases	Sep. 30, 2012 Litigation related to alleged anti-trust violations [Member] Cases	Mar. 31, 2014 Minimum [Member] Litigation related to travel transaction taxes [Member] GovernmentalUnit	Mar. 31, 2014 State of California [Member] Minimum [Member] Litigation related to travel transaction taxes [Member] GovernmentalUnit	Jan. 31, 2013 City and County of San Francisco [Member] Litigation related to travel transaction taxes [Member]	Jul. 31, 2009 City and County of San Francisco [Member] Litigation related to travel transaction taxes [Member]	Mar. 31, 2014 Hawaii [Member] Litigation related to travel transaction taxes [Member]	Mar. 31, 2013 Hawaii [Member] Litigation related to travel transaction taxes [Member]	Dec. 31, 2012 Hawaii [Member] Litigation related to travel transaction taxes [Member]	Mar. 31, 2013 District of Columbia [Member] Litigation related to travel transaction taxes [Member]	Sep. 30, 2012 District of Columbia [Member] Litigation related to travel transaction taxes [Member]
Travel Transaction Taxes
Approximate number of lawsuits brought by or against states, cities and counties over issues involving the payment of travel transaction taxes (in cases)	40
Minimum number of municipalities and counties which have initiated audit proceedings (in governmental units)					79	40
Minimum number of states which have initiated audit proceedings (in governmental units)					11
Assessed taxes including interest and penalties (in dollars)							$ 2.7	$ 3.4		$ 18.7	$ 16.5	$ 5.6	$ 4.8
Payments of tax and interest for loss contingency related to travel transaction taxes (in dollars)									0.6
Accrual for the potential resolution of issues related to travel transaction taxes (in dollars)	$ 54	$ 55
Loss contingency complaint filed alleging antitrust violations				1
Loss contingency other complaints alleging antitrust violations			31