INCOME TAXES (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Dec. 31, 2009
INCOME TAXES
Income tax benefit due to lower estimated annual effective tax rate	$ 2,000,000
(Benefits) provision for tax on income from continuing operations	(32,003,000)	15,516,000	(6,444,000)	26,974,000
Pre tax income	35,970,000	37,956,000	127,327,000	50,238,000
Deferred tax liability in connection with the acquisition	43,600,000		43,600,000
Match's equity method investment in Meetic (as a percent)						27.00%
Effective tax rate (as a percent)		41.00%		54.00%
Federal statutory rate (as a percent)		35.00%		35.00%
Total unrecognized tax benefits including interest	481,000,000		481,000,000		487,600,000
Portion of unrecognized tax benefits included in non-current income taxes payable	467,900,000		467,900,000
Portion of unrecognized tax benefits related to deferred tax assets included in other non-current assets	12,300,000		12,300,000
Portion of unrecognized tax benefits included in accrued expenses and other current liabilities	800,000		800,000
Unrecognized tax benefits, tax positions for which the ultimate deductibility is highly certain but timing is uncertain	92,000,000		92,000,000
Unrecognized tax benefit, if recognized would reduce income tax provision for continuing operations	101,400,000		101,400,000
Unrecognized tax benefit, if recognized would reduce income tax provision for discontinued operations	212,600,000		212,600,000
Income tax provision for continuing operations upon the subsequent recognition of unrecognized tax benefits	4,500,000		4,500,000
Interest expense related to unrecognized tax benefits from continuing operations	2,200,000		2,800,000
Interest expense related to unrecognized tax benefits from discontinued operations	1,900,000		5,200,000
Deferred taxes related to interest on unrecognized tax benefits from continuing operations	1,400,000		1,800,000
Deferred taxes related to interest on unrecognized tax benefits from discontinued operations	1,200,000		3,300,000
Accrued interest on unrecognized tax benefits	111,000,000		111,000,000		97,700,000
Accrued penalties on unrecognized tax benefits	4,500,000		4,500,000		5,000,000
Reasonably possible decrease in unrecognized tax benefits within next twelve months	53,400,000		53,400,000
Reasonably possible decrease in income tax provision within next twelve months	$ 8,100,000		$ 8,100,000