REDEEMABLE NONCONTROLLING INTERESTS (Details) (USD $)	3 Months Ended	1 Months Ended	3 Months Ended				1 Months Ended			1 Months Ended
	Mar. 31, 2012	May 18, 2010 Priceline.com International Limited (PIL)	Mar. 31, 2012 Priceline.com International Limited (PIL)		Mar. 31, 2011 Priceline.com International Limited (PIL)		Apr. 30, 2011 Travel Jigsaw Holdings Limited [Member]	Jun. 30, 2010 Travel Jigsaw Holdings Limited [Member]	Mar. 31, 2012 Travel Jigsaw Holdings Limited [Member]	Apr. 30, 2012 Travel Jigsaw Holdings Limited [Member] Acquisition [Member]
Acquisition of Controlling and Redeemable Controlling Interest
Payments to purchase a controlling interest of the outstanding equity of TravelJigsaw Holdings Limited and its operating subsidiary		$ 108,500,000
Percent purchased, by certain key members of the management team of Booking.com, of ownership interest in TravelJigsaw from PIL (as a percent)								3.00%
Noncontrolling interests, aggregate purchase price of remaining outstanding shares							13,000,000			61,100,000
Parent ownership percentage									19.00%	12.70%
Reconciliation of redeemable noncontrolling interests
Balance, December 31	127,045,000		127,045,000		45,751,000
Net income attributable to noncontrolling interests			(154,000)		(777,000)
Fair value adjustments	(52,214,000)		52,214,000	[1]	10,355,000	[1]
Currency translation adjustments			4,211,000		2,209,000
Balance, March 31	$ 183,316,000		$ 183,316,000		$ 57,538,000

[1] The fair value of the redeemable noncontrolling interests was determined by industry peer comparable analysis and a discounted cash flow valuation model.