GOODWILL AND INTANGIBLE ASSETS (Details2) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Balance of goodwill by reporting unit, including the changes in the carrying value of goodwill
Balance at the beginning of the period	$ 1,675,323,000	$ 1,616,154,000
Additions	165,095,000	67,781,000
(Deductions)	(35,441,000)	(14,014,000)
Foreign Exchange Translation	(50,051,000)	5,402,000
Balance at the end of the period	1,754,926,000	1,675,323,000
Search & Applications
Balance of goodwill by reporting unit, including the changes in the carrying value of goodwill
Balance at the beginning of the period	738,062,000	723,650,000
Additions	71,616,000
(Deductions)	(33,510,000)	(160,000)
Goodwill Transfers During Period		14,572,000
Foreign Exchange Translation	(1,346,000)
Balance at the end of the period	774,822,000	738,062,000
Goodwill accumulated impairment losses	916,900,000	916,900,000	916,900,000
The Match Group
Balance of goodwill by reporting unit, including the changes in the carrying value of goodwill
Balance at the beginning of the period	775,403,000	718,736,000
Additions	72,833,000	62,464,000
(Deductions)	(1,931,000)	(10,675,000)
Foreign Exchange Translation	(47,508,000)	4,878,000
Balance at the end of the period	798,797,000	775,403,000
Media - Connected Ventures
Balance of goodwill by reporting unit, including the changes in the carrying value of goodwill
Balance at the beginning of the period	8,267,000	8,267,000
Additions	0	0
(Deductions)	0	0
Goodwill Transfers During Period		0
Foreign Exchange Translation	0	0
Balance at the end of the period	8,267,000	8,267,000
Goodwill accumulated impairment losses	11,600,000	11,600,000	11,600,000
Total eCommerce
Balance of goodwill by reporting unit, including the changes in the carrying value of goodwill
Balance at the beginning of the period	153,591,000	165,501,000
Additions	20,646,000	5,317,000
(Deductions)		(3,179,000)
Goodwill Transfers During Period		14,572,000
Foreign Exchange Translation	(1,197,000)	524,000
Balance at the end of the period	173,040,000	153,591,000
HomeAdvisor
Balance of goodwill by reporting unit, including the changes in the carrying value of goodwill
Balance at the beginning of the period	131,872,000	111,658,000
Additions	20,646,000	5,317,000
Goodwill Transfers During Period		14,373,000
Foreign Exchange Translation	(1,197,000)	524,000
Balance at the end of the period	151,321,000	131,872,000
CityGrid
Balance of goodwill by reporting unit, including the changes in the carrying value of goodwill
Balance at the beginning of the period		32,124,000
(Deductions)		(3,179,000)
Goodwill Transfers During Period		(28,945,000)
ShoeBuy
Balance of goodwill by reporting unit, including the changes in the carrying value of goodwill
Balance at the beginning of the period	21,719,000	21,719,000
Additions	0	0
(Deductions)	0	0
Goodwill Transfers During Period		0
Foreign Exchange Translation	0	0
Balance at the end of the period	21,719,000	21,719,000
Goodwill accumulated impairment losses	$ 28,000,000	$ 28,000,000	$ 28,000,000