NONCONTROLLING INTERESTS (Details) (USD $)	1 Months Ended		12 Months Ended			1 Months Ended	3 Months Ended		12 Months Ended										1 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	May 18, 2010 Priceline.com International Limited (PIL)	Jun. 30, 2010 Priceline.com International Limited (PIL)		Dec. 31, 2012 Priceline.com International Limited (PIL)		Dec. 31, 2011 Priceline.com International Limited (PIL)		Dec. 31, 2010 Priceline.com International Limited (PIL)		Apr. 30, 2012 Priceline.com International Limited (PIL)	Apr. 30, 2011 Priceline.com International Limited (PIL)	Mar. 31, 2011 Priceline.com International Limited (PIL)	May 31, 2010 Priceline.com International Limited (PIL)	Jun. 30, 2010 Booking.com Limited
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
Transaction costs							1,900,000
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	61,100,000	13,000,000	61,079,000	12,986,000	0
Noncontrolling Interest, Ownership Percentage by Parent															12.70%	19.00%	24.40%
Reconciliation of redeemable noncontrolling interests
Balance, Beginning of Year			127,045,000						127,045,000		45,751,000		0
Fair value at acquisition									0		0							29,520,000
Net income attributable to noncontrolling interests									4,471,000		2,760,000		601,000
Redeemable Noncontrolling Interests Fair Value Adjustments Combined			84,693,000	91,743,000	7,876,000								7,876,000	[1]
Fair value adjustment combined			(84,693,000)	(91,743,000)	(7,876,000)				84,693,000	[1]	91,743,000	[1]
Sale of subsidiary shares at fair value							4,311,000	[2]	0		0
Purchase of subsidiary shares at fair value									(61,079,000)	[1]	(12,986,000)	[1]	0	[1]
Currency translation adjustments									5,157,000		(223,000)		3,443,000
Balance, End of Year			$ 160,287,000	$ 127,045,000					$ 160,287,000		$ 127,045,000		$ 45,751,000

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

[2] The Company retained a controlling interest after the sale of the subsidiary shares in June 2010.