GUARANTOR AND NONGUARANTOR FINANCIAL INFORMATION (Details 3) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities attributable to continuing operations	$ 424,048	$ 410,961	$ 354,527
Acquisitions, net of cash acquired	(259,391)	(40,434)	(400,254)
Capital expenditures	(57,233)	(80,311)	(51,201)
Proceeds from maturities and sales of marketable debt securities	21,644	12,502	195,501
Purchases of marketable debt securities	(175,826)		(53,952)
Proceeds from sales of long-term investments, assets and a business	58,388	83,091	14,616
Purchases of long-term investments	(24,334)	(51,080)	(36,094)
Other, net	(3,042)	(3,529)	(9,923)
Net cash used in investing activities attributable to continuing operations	(439,794)	(79,761)	(341,307)
Proceeds from issuance of long-term debt		500,000us-gaap_ProceedsFromIssuanceOfDebt	500,000us-gaap_ProceedsFromIssuanceOfDebt
Principal payments on long-term debt	0us-gaap_RepaymentsOfLongTermDebt	(15,844)us-gaap_RepaymentsOfLongTermDebt	0us-gaap_RepaymentsOfLongTermDebt
Purchase of treasury stock		(264,214)	(691,830)
Dividends	(97,338)us-gaap_PaymentsOfDividendsCommonStock	(79,189)us-gaap_PaymentsOfDividendsCommonStock	(68,163)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from Issuance or Sale of Equity	1,609	(5,077)	262,841
Excess tax benefits from stock-based awards	44,957	32,891	57,101
Purchase of noncontrolling Interests	(33,165)us-gaap_PaymentsToMinorityShareholders	(67,947)us-gaap_PaymentsToMinorityShareholders	(4,891)us-gaap_PaymentsToMinorityShareholders
Funds returned from (transferred to) escrow for Meetic tender offer	12,354	(71,512)	0
Acquisition-related contingent consideration payments	(8,109)	(256)	(10,781)
Debt issuance Costs	(383)us-gaap_PaymentsOfDebtIssuanceCosts	(7,399)us-gaap_PaymentsOfDebtIssuanceCosts	(11,001)us-gaap_PaymentsOfDebtIssuanceCosts
Other, net	(905)	(3,787)	244
Net cash (used in) provided by financing activities attributable to continuing operations	(80,980)	17,666	33,520
Total cash (used in) provided by continuing operations	(96,726)	348,866	46,740
Total cash used in discontinued operations	(145)	(1,877)	(3,472)
Effect of exchange rate changes on cash and cash equivalents	(13,168)	3,478	2,556
Net (decrease) increase in cash and cash equivalents	(110,039)	350,467	45,824
Cash and cash equivalents at beginning of period	1,100,444	749,977	704,153
Cash and cash equivalents at end of period	990,405	1,100,444	749,977
IAC
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities attributable to continuing operations	(114,773)	(95,081)	(116,353)
Acquisitions, net of cash acquired	0	0	(35,159)
Capital expenditures	(1,843)	(1,387)	(3,969)
Proceeds from maturities and sales of marketable debt securities	21,644	12,502	195,501
Purchases of marketable debt securities	(175,826)		(53,952)
Proceeds from sales of long-term investments, assets and a business	0	7,839	14,194
Purchases of long-term investments	(4,800)	(17,814)	(27,187)
Other, net	(2,000)	0	(351)
Net cash used in investing activities attributable to continuing operations	(162,825)	1,140	89,077
Proceeds from issuance of long-term debt		500,000	500,000
Principal payments on long-term debt		(15,844)
Purchase of treasury stock		(264,214)	(691,830)
Dividends	(97,338)	(79,189)	(68,163)
Proceeds from Issuance or Sale of Equity	1,609	(5,077)	262,841
Excess tax benefits from stock-based awards	34,214	32,081	52,209
Purchase of noncontrolling Interests	0	0	(1,936)
Funds returned from (transferred to) escrow for Meetic tender offer	0	0
Acquisition-related contingent consideration payments	0	0	0
Debt issuance Costs	(383)	(7,399)	(11,001)
Intercompany	323,666	216,359	(55,020)
Other, net	0
Net cash (used in) provided by financing activities attributable to continuing operations	261,768	376,717	(12,900)
Total cash (used in) provided by continuing operations	(15,830)	282,776	(40,176)
Total cash used in discontinued operations	(116)	(1,829)	(3,971)
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net (decrease) increase in cash and cash equivalents	(15,946)	280,947	(44,147)
Cash and cash equivalents at beginning of period	782,022	501,075	545,222
Cash and cash equivalents at end of period	766,076	782,022	501,075
Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities attributable to continuing operations	543,087	537,116	453,692
Acquisitions, net of cash acquired	(191,238)	(6,382)	(331,182)
Capital expenditures	(40,422)	(63,931)	(29,550)
Proceeds from maturities and sales of marketable debt securities	0	0	0
Purchases of marketable debt securities	0		0
Proceeds from sales of long-term investments, assets and a business	0	50,850	272
Purchases of long-term investments	(7,043)	0	(724)
Other, net	11	(1,725)	(155)
Net cash used in investing activities attributable to continuing operations	(238,692)	(21,188)	(361,339)
Principal payments on long-term debt		0
Dividends	0
Proceeds from Issuance or Sale of Equity	0
Excess tax benefits from stock-based awards	0		4,892
Purchase of noncontrolling Interests	(30,000)	0	0
Funds returned from (transferred to) escrow for Meetic tender offer	0	0
Acquisition-related contingent consideration payments	(736)	(256)	(10,781)
Debt issuance Costs	0	0	0
Intercompany	(271,309)	(514,464)	(86,446)
Other, net	(1,365)	(1,225)
Net cash (used in) provided by financing activities attributable to continuing operations	(303,410)	(515,945)	(92,335)
Total cash (used in) provided by continuing operations	985	(17)	18
Total cash used in discontinued operations	0
Effect of exchange rate changes on cash and cash equivalents	36	17	(18)
Net (decrease) increase in cash and cash equivalents	1,021	0	0
Cash and cash equivalents at beginning of period	0	0	0
Cash and cash equivalents at end of period	1,021	0	0
Non-Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities attributable to continuing operations	(4,266)	(31,074)	17,188
Acquisitions, net of cash acquired	(68,153)	(34,052)	(33,913)
Capital expenditures	(14,968)	(14,993)	(17,682)
Proceeds from maturities and sales of marketable debt securities	0	0	0
Purchases of marketable debt securities	0		0
Proceeds from sales of long-term investments, assets and a business	58,388	24,402	150
Purchases of long-term investments	(12,491)	(33,266)	(8,183)
Other, net	(1,053)	(1,804)	(9,417)
Net cash used in investing activities attributable to continuing operations	(38,277)	(59,713)	(69,045)
Principal payments on long-term debt		0
Dividends	0
Proceeds from Issuance or Sale of Equity	0
Excess tax benefits from stock-based awards	10,743	810
Purchase of noncontrolling Interests	(3,165)	(67,947)	(2,955)
Funds returned from (transferred to) escrow for Meetic tender offer	12,354	(71,512)
Acquisition-related contingent consideration payments	(7,373)	0	0
Debt issuance Costs	0	0	0
Intercompany	(52,357)	298,105	141,466
Other, net	460	(2,562)	244
Net cash (used in) provided by financing activities attributable to continuing operations	(39,338)	156,894	138,755
Total cash (used in) provided by continuing operations	(81,881)	66,107	86,898
Total cash used in discontinued operations	(29)	(48)	499
Effect of exchange rate changes on cash and cash equivalents	(13,204)	3,461	2,574
Net (decrease) increase in cash and cash equivalents	(95,114)	69,520	89,971
Cash and cash equivalents at beginning of period	318,422	248,902	158,931
Cash and cash equivalents at end of period	223,308	318,422	248,902
IAC Consolidated
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities attributable to continuing operations	424,048	410,961	354,527
Acquisitions, net of cash acquired	(259,391)	(40,434)	(400,254)
Capital expenditures	(57,233)	(80,311)	(51,201)
Proceeds from maturities and sales of marketable debt securities	21,644	12,502	195,501
Purchases of marketable debt securities	(175,826)		(53,952)
Proceeds from sales of long-term investments, assets and a business	58,388	83,091	14,616
Purchases of long-term investments	(24,334)	(51,080)	(36,094)
Other, net	(3,042)	(3,529)	(9,923)
Net cash used in investing activities attributable to continuing operations	(439,794)	(79,761)	(341,307)
Proceeds from issuance of long-term debt		500,000	500,000
Principal payments on long-term debt		(15,844)
Purchase of treasury stock		(264,214)	(691,830)
Dividends	(97,338)	(79,189)	(68,163)
Proceeds from Issuance or Sale of Equity	1,609	(5,077)	262,841
Excess tax benefits from stock-based awards	44,957	32,891	57,101
Purchase of noncontrolling Interests	(33,165)	(67,947)	(4,891)
Funds returned from (transferred to) escrow for Meetic tender offer	12,354	(71,512)
Acquisition-related contingent consideration payments	(8,109)	(256)	(10,781)
Debt issuance Costs	(383)	(7,399)	(11,001)
Intercompany	0	0	0
Other, net	(905)	(3,787)	244
Net cash (used in) provided by financing activities attributable to continuing operations	(80,980)	17,666	33,520
Total cash (used in) provided by continuing operations	(96,726)	348,866	46,740
Total cash used in discontinued operations	(145)	(1,877)	(3,472)
Effect of exchange rate changes on cash and cash equivalents	(13,168)	3,478	2,556
Net (decrease) increase in cash and cash equivalents	(110,039)	350,467	45,824
Cash and cash equivalents at beginning of period	1,100,444	749,977	704,153
Cash and cash equivalents at end of period	$ 990,405	$ 1,100,444	$ 749,977

Business combination contingent consideration cash payment financing.

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as financing activities.

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The cash inflow (outflow) related to intercompany activity between an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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The increase (decrease) in cash associated with the entity's continuing operating, investing, and financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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Increase (decrease) in cash associated with the entity's discontinued operations.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash outflow to reacquire common stock during the period.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow to acquire debt securities classified as available-for-sale securities, because they are not classified as either held-to-maturity securities or trading securities.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, beyond the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the long-term.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

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- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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- Definition

The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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