INTANGIBLE ASSETS AND GOODWILL (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 24, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Jul. 24, 2017	Dec. 31, 2016
Finite-lived intangible assets
Gross Carrying Amount						$ 3,029,921		$ 2,651,667
Accumulated Amortization						(811,769)		(657,782)
Net Carrying Amount						2,218,152		1,993,885
Amortization		$ 45,300	$ 42,000	$ 129,476	$ 127,375
Annual estimated amortization expense for intangible assets
Remainder of 2017						46,160
2018						171,825
2019						160,335
2020						152,397
2021						146,295
2022						143,507
Thereafter						1,397,633
Total						2,218,152
Goodwill:
Balance at December 31, 2016				2,396,906
Acquisitions				292,705
Foreign currency translation adjustments				38,286
Balance at September 30, 2017		2,727,897		2,727,897
Impairment of goodwill		0	940,700	0	$ 940,700
Goodwill		$ 2,727,897		$ 2,396,906		2,727,897		2,396,906
Supply and distribution agreements [Member]
Finite-lived intangible assets
Gross Carrying Amount						1,050,965		809,287
Accumulated Amortization						(335,538)		(270,813)
Net Carrying Amount						715,427		538,474
Finite lived intangibles, weighted average useful life				16 years
Technology [Member]
Finite-lived intangible assets
Gross Carrying Amount						136,667		112,141
Accumulated Amortization						(98,008)		(80,549)
Net Carrying Amount						38,659		31,592
Finite lived intangibles, weighted average useful life				5 years
Patents [Member]
Finite-lived intangible assets
Gross Carrying Amount						1,623		1,623
Accumulated Amortization						(1,623)		(1,598)
Net Carrying Amount						0		25
Finite lived intangibles, weighted average useful life				15 years
Goodwill:
Finite-lived intangible assets, useful life				15 years
Internet domain names [Member]
Finite-lived intangible assets
Gross Carrying Amount						41,620		39,495
Accumulated Amortization						(27,616)		(25,089)
Net Carrying Amount						14,004		14,406
Finite lived intangibles, weighted average useful life				8 years
Trade Names [Member]
Finite-lived intangible assets
Gross Carrying Amount						1,777,146		1,667,221
Accumulated Amortization						(327,403)		(261,412)
Net Carrying Amount						1,449,743		1,405,809
Finite lived intangibles, weighted average useful life				19 years
Noncompete Agreements [Member]
Finite-lived intangible assets
Gross Carrying Amount						21,900		21,900
Accumulated Amortization						(21,581)		(18,321)
Net Carrying Amount						$ 319		$ 3,579
Finite lived intangibles, weighted average useful life				3 years
Minimum | Supply and distribution agreements [Member]
Goodwill:
Finite-lived intangible assets, useful life				3 years
Minimum | Technology [Member]
Goodwill:
Finite-lived intangible assets, useful life				1 year
Minimum | Internet domain names [Member]
Goodwill:
Finite-lived intangible assets, useful life				2 years
Minimum | Trade Names [Member]
Goodwill:
Finite-lived intangible assets, useful life				4 years
Minimum | Noncompete Agreements [Member]
Goodwill:
Finite-lived intangible assets, useful life				3 years
Maximum | Supply and distribution agreements [Member]
Goodwill:
Finite-lived intangible assets, useful life				20 years
Maximum | Technology [Member]
Goodwill:
Finite-lived intangible assets, useful life				5 years
Maximum | Internet domain names [Member]
Goodwill:
Finite-lived intangible assets, useful life				20 years
Maximum | Trade Names [Member]
Goodwill:
Finite-lived intangible assets, useful life				20 years
Maximum | Noncompete Agreements [Member]
Goodwill:
Finite-lived intangible assets, useful life				4 years
OpenTable [Member]
Goodwill:
Percentage change in fair value year-over-year						18.00%
Percentage of carrying value in excess of fair value						6.00%
Percentage of the fair value of implied goodwill in excess of the carrying value of goodwill						24.00%
Impairment of goodwill			$ 940,700
Momondo Group [Member]
Goodwill:
Balance at September 30, 2017	$ 287,200
Payments to Acquire Businesses, Gross	555,500
Identifiable intangible assets							$ 333,800
Goodwill	$ 287,200						287,200
Momondo Group [Member] | Supply and distribution agreements [Member]
Goodwill:
Identifiable intangible assets							214,000
Finite-lived intangible assets, useful life	15 years
Momondo Group [Member] | Technology [Member]
Goodwill:
Identifiable intangible assets							15,400
Finite-lived intangible assets, useful life	4 years
Momondo Group [Member] | Trade Names [Member]
Goodwill:
Identifiable intangible assets							$ 104,400
Finite-lived intangible assets, useful life	13 years