GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - STATEMENT OF CASH FLOWS (Details3) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities attributable to continuing operations	$ 65,929	$ 85,779
Cash flows from investing activities attributable to continuing operations:
Acquisitions, net of cash acquired	(2,524)	(43,286)
Capital expenditures	(35,133)	(26,816)
Purchase of time deposits	(87,500)	0
Proceeds from maturities of time deposits	87,500	0
Proceeds from maturities and sales of marketable debt securities	32,500	14,613
Purchases of marketable debt securities	(79,366)	(93,134)
Purchases of investments	(5,056)	(12,840)
Net proceeds from the sale of businesses and investments	103,735	6,203
Other, net	4,815	2,396
Net cash provided by (used in) investing activities attributable to continuing operations	18,971	(152,864)
Cash flows from financing activities attributable to continuing operations:
Purchase of treasury stock	(214,635)	(200,000)
Proceeds from Match Group 2016 Senior Notes offering	400,000	0
Principal payments on Match Group Term Loan	(410,000)	0
Debt issuance costs	(4,621)	0
Dividends	0	(56,729)
Repurchase of Senior Notes	(61,110)	0
Issuance of IAC common stock pursuant to stock-based awards, net of withholding taxes	(13,097)	(20,656)
Issuance of Match Group common stock pursuant to stock-based awards, net of withholding taxes	2,176	0
Excess tax benefits from stock-based awards	21,871	36,465
Purchase of noncontrolling interests	(2,411)	(15,338)
Acquisition-related contingent consideration payments	(2,150)	(5,705)
Increase in restricted cash related to bond redemptions	(30,002)	0
Intercompany	0	0
Other, net	(488)	430
Net cash used in financing activities attributable to continuing operations	(314,467)	(261,533)
Total cash used in continuing operations	(229,567)	(328,618)
Total cash (used in) provided by discontinued operations	0	(243)
Effect of exchange rate changes on cash and cash equivalents	(5,896)	(5,135)
Net decrease in cash and cash equivalents	(235,463)	(333,996)
Cash and cash equivalents at beginning of period	1,481,447	990,405
Cash and cash equivalents at end of period	1,245,984	656,409
IAC
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities attributable to continuing operations	(83,685)	(107,149)
Cash flows from investing activities attributable to continuing operations:
Acquisitions, net of cash acquired	0	0
Capital expenditures	(299)	(988)
Purchase of time deposits	0
Proceeds from maturities of time deposits	0
Proceeds from maturities and sales of marketable debt securities	32,500	14,613
Purchases of marketable debt securities	(79,366)	(93,134)
Purchases of investments	0	0
Net proceeds from the sale of businesses and investments	10,000	0
Other, net	0	3,613
Net cash provided by (used in) investing activities attributable to continuing operations	(37,165)	(75,896)
Cash flows from financing activities attributable to continuing operations:
Purchase of treasury stock	(214,635)	(200,000)
Proceeds from Match Group 2016 Senior Notes offering	0
Principal payments on Match Group Term Loan	0
Debt issuance costs	0
Dividends		(56,729)
Repurchase of Senior Notes	(61,110)
Issuance of IAC common stock pursuant to stock-based awards, net of withholding taxes	(13,097)	(20,656)
Issuance of Match Group common stock pursuant to stock-based awards, net of withholding taxes	0
Excess tax benefits from stock-based awards	16,651	19,064
Purchase of noncontrolling interests	(1,400)	0
Acquisition-related contingent consideration payments	0	0
Increase in restricted cash related to bond redemptions	(30,002)
Intercompany	31,974	107,529
Other, net	275	166
Net cash used in financing activities attributable to continuing operations	(271,344)	(150,626)
Total cash used in continuing operations	(392,194)	(333,671)
Total cash (used in) provided by discontinued operations		(246)
Effect of exchange rate changes on cash and cash equivalents	0	0
Net decrease in cash and cash equivalents	(392,194)	(333,917)
Cash and cash equivalents at beginning of period	1,073,053	762,231
Cash and cash equivalents at end of period	680,859	428,314
Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities attributable to continuing operations	76,888	129,741
Cash flows from investing activities attributable to continuing operations:
Acquisitions, net of cash acquired	0	(2,574)
Capital expenditures	(11,256)	(11,533)
Purchase of time deposits	0
Proceeds from maturities of time deposits	0
Proceeds from maturities and sales of marketable debt securities	0	0
Purchases of marketable debt securities	0	0
Purchases of investments	0	0
Net proceeds from the sale of businesses and investments	0	0
Other, net	158	48
Net cash provided by (used in) investing activities attributable to continuing operations	(11,098)	(14,059)
Cash flows from financing activities attributable to continuing operations:
Purchase of treasury stock	0	0
Proceeds from Match Group 2016 Senior Notes offering	0
Principal payments on Match Group Term Loan	0
Debt issuance costs	0
Dividends		0
Repurchase of Senior Notes	0
Issuance of IAC common stock pursuant to stock-based awards, net of withholding taxes	0	0
Issuance of Match Group common stock pursuant to stock-based awards, net of withholding taxes	0
Excess tax benefits from stock-based awards	0	0
Purchase of noncontrolling interests	0	0
Acquisition-related contingent consideration payments	(321)	(195)
Increase in restricted cash related to bond redemptions	0
Intercompany	(65,469)	(115,487)
Other, net	0	0
Net cash used in financing activities attributable to continuing operations	(65,790)	(115,682)
Total cash used in continuing operations	0	0
Total cash (used in) provided by discontinued operations		0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net decrease in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Non-Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities attributable to continuing operations	72,726	63,187
Cash flows from investing activities attributable to continuing operations:
Acquisitions, net of cash acquired	(2,524)	(40,712)
Capital expenditures	(23,578)	(14,295)
Purchase of time deposits	(87,500)
Proceeds from maturities of time deposits	87,500
Proceeds from maturities and sales of marketable debt securities	0	0
Purchases of marketable debt securities	0	0
Purchases of investments	(5,056)	(12,840)
Net proceeds from the sale of businesses and investments	93,735	6,203
Other, net	4,657	(1,265)
Net cash provided by (used in) investing activities attributable to continuing operations	67,234	(62,909)
Cash flows from financing activities attributable to continuing operations:
Purchase of treasury stock	0	0
Proceeds from Match Group 2016 Senior Notes offering	400,000
Principal payments on Match Group Term Loan	(410,000)
Debt issuance costs	(4,621)
Dividends		0
Repurchase of Senior Notes	0
Issuance of IAC common stock pursuant to stock-based awards, net of withholding taxes	0	0
Issuance of Match Group common stock pursuant to stock-based awards, net of withholding taxes	2,176
Excess tax benefits from stock-based awards	5,220	17,401
Purchase of noncontrolling interests	(1,011)	(15,338)
Acquisition-related contingent consideration payments	(1,829)	(5,510)
Increase in restricted cash related to bond redemptions	0
Intercompany	33,495	7,958
Other, net	(763)	264
Net cash used in financing activities attributable to continuing operations	22,667	4,775
Total cash used in continuing operations	162,627	5,053
Total cash (used in) provided by discontinued operations		3
Effect of exchange rate changes on cash and cash equivalents	(5,896)	(5,135)
Net decrease in cash and cash equivalents	156,731	(79)
Cash and cash equivalents at beginning of period	408,394	228,174
Cash and cash equivalents at end of period	$ 565,125	$ 228,095