REDEEMABLE NONCONTROLLING INTERESTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended				1 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2013 Priceline.com International Limited (PIL)		Apr. 30, 2013 Travel Jigsaw Holdings Limited [Member]	Jun. 30, 2010 Travel Jigsaw Holdings Limited [Member]
Acquisition of Controlling and Redeemable Controlling Interest
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			$ 0	$ 192,530			$ 192,500
Reconciliation of redeemable noncontrolling interests
Balance, beginning of period					160,287
Net income attributable to noncontrolling interests	0	0	0	(135)	135
Fair value adjustments (1)			0	42,522	42,522	[1]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests					(192,530)	[1]
Currency translation adjustments					(10,414)
Balance, end of period					$ 0

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