Match (MTCH) 10-Q 1 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	3 Months Ended
	Mar. 31, 2015	Apr. 24, 2015
Entity Registrant Name	IAC/INTERACTIVECORP
Entity Central Index Key	891103
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Entity Public Float		$5,469,956,006
Document Type	10-Q
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Amendment Flag	FALSE
Common Stock
Entity Common Stock, Shares Outstanding		76,278,660
Class B Convertible Common Stock
Entity Common Stock, Shares Outstanding		5,789,499

CONSOLIDATED_BALANCE_SHEET

CONSOLIDATED BALANCE SHEET (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
ASSETS
Cash and cash equivalents	$671,597	$990,405
Marketable securities	205,621	160,648
Accounts receivable, net of allowance of $13,128 and $12,437, respectively	232,464	236,086
Other current assets	184,261	166,742
Total current assets	1,293,943	1,553,881
Property and equipment, net of accumulated depreciation and amortization of $291,091 and $279,534, respectively	297,956	302,459
Goodwill	1,720,901	1,754,926
Intangible assets, net of accumulated amortization of $102,995 and $98,937, respectively	469,552	491,936
Long-term investments	123,679	114,983
Other non-current assets	52,074	56,693
TOTAL ASSETS	3,958,105	4,274,878
LIABILITIES:
Accounts payable, trade	83,446	81,163
Deferred revenue	214,476	194,988
Accrued expenses and other current liabilities	327,830	397,803
Total current liabilities	625,752	673,954
Long-term debt	1,080,000	1,080,000
Income taxes payable	29,300	32,635
Deferred income taxes	407,784	409,529
Other long-term liabilities	34,260	45,191
Redeemable noncontrolling interests	28,295	40,427
Commitments and contingencies
SHAREHOLDERS' EQUITY:
Additional paid-in capital	11,434,220	11,415,617
Retained earnings	322,848	325,118
Accumulated other comprehensive loss	-143,273	-87,700
Treasury stock 187,137,267 and 184,182,001 shares, respectively	-9,861,350	-9,661,350
Total IAC shareholders' equity	1,752,714	1,991,953
Noncontrolling interests	0	1,189
Total shareholders' equity	1,752,714	1,993,142
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	3,958,105	4,274,878
Common Stock
SHAREHOLDERS' EQUITY:
Common stock	253	252
Class B Convertible Common Stock
SHAREHOLDERS' EQUITY:
Common stock	$16	$16

CONSOLIDATED_BALANCE_SHEET_Par

CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Accounts receivable, allowance (in dollars)	$13,128	$12,437
Accumulated Depreciation and Amortization, Property and Equipment (in dollars)	291,091	279,534
Accumulated Amortization (in dollars)	$102,995	$98,937
Treasury stock, shares	187,137,267	184,182,001
Common Stock
Common stock, par value (in dollars per share)	$0.00	$0.00
Common stock, authorized shares	1,600,000,000	1,600,000,000
Common stock, issued shares	252,899,453	252,170,058
Common stock, outstanding shares	76,130,186	78,356,057
Class B Convertible Common Stock
Common stock, par value (in dollars per share)	$0.00	$0.00
Common stock, authorized shares	400,000,000	400,000,000
Common stock, issued shares	16,157,499	16,157,499
Common stock, outstanding shares	5,789,499	5,789,499

CONSOLIDATED_STATEMENT_OF_OPER

CONSOLIDATED STATEMENT OF OPERATIONS (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenue	$772,512	$740,247
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	191,553	209,234
Selling and marketing expense	357,666	298,599
General and administrative expense	114,794	95,089
Product development expense	45,257	38,816
Depreciation	15,568	14,818
Amortization of intangibles	12,555	11,979
Total operating costs and expenses	737,393	668,535
Operating income	35,119	71,712
Interest expense	-14,064	-14,064
Other income (expense), net	6,988	-1,958
Earnings from continuing operations before income taxes	28,043	55,690
Income tax provision	-6,180	-21,385
Earnings from continuing operations	21,863	34,305
Earnings (loss) from discontinued operations, net of tax	125	-814
Net earnings	21,988	33,491
Net loss attributable to noncontrolling interests	4,417	2,394
Net earnings attributable to IAC shareholders	26,405	35,885
Per share information attributable to IAC shareholders:
Basic earnings per share from continuing operations (in dollars per share)	$0.31	$0.44
Diluted earnings per share from continuing operations (in dollars per share)	$0.30	$0.42
Basic earnings per share (in dollars per share)	$0.32	$0.44
Diluted earnings per share (in dollars per share)	$0.30	$0.41
Dividends declared per share (in dollars per share)	$0.34	$0.24
Stock-based compensation expense by function:
Total non-cash compensation expense	18,911	9,613
Cost of revenue
Stock-based compensation expense by function:
Total non-cash compensation expense	245	-8
Selling and marketing expense
Stock-based compensation expense by function:
Total non-cash compensation expense	1,723	196
General and administrative expense
Stock-based compensation expense by function:
Total non-cash compensation expense	14,598	7,952
Product development expense
Stock-based compensation expense by function:
Total non-cash compensation expense	$2,345	$1,473

CONSOLIDATED_STATEMENT_OF_COMP

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net earnings	$21,988	$33,491
Other comprehensive (loss) income, net of tax:
Change in foreign currency translation adjustment	-56,614	5,377
Change in unrealized gains and losses of available-for-sale securities (net of tax benefits of $56 of 2015 and $573 in 2014)	634	-111
Net current period other comprehensive loss	-55,980	5,266
Comprehensive (loss) income	-33,992	38,757
Comprehensive loss attributable to noncontrolling interests	4,824	2,477
Comprehensive (loss) income attributable to IAC shareholders	($29,168)	$41,234

CONSOLIDATED_STATEMENT_OF_COMP1

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Tax benefit of change in unrealized gains and losses of available-for-sale securities	$56	$573

CONSOLIDATED_STATEMENT_OF_SHAR

CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (USD $)	Total	IAC	Common Stock	Common Stock	Additional Paid-in Capital	(Accumulated Deficit) Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interests	Redeemable Noncontrolling Interests
In Thousands, unless otherwise specified				Class B Convertible Common Stock
Redeemable noncontrolling interests, balance at Dec. 31, 2014	$40,427									$40,427
Balance at Dec. 31, 2014	1,993,142	1,991,953	252	16	11,415,617	325,118	-87,700	-9,661,350	1,189
Balance (in shares) at Dec. 31, 2014			252,170	16,157
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings for the three months ended March 31, 2015	26,405	26,405				26,405			0
Redeemable noncontrolling interests, net loss for the three months ended March 31, 2015										-4,417
Other comprehensive loss, net of tax	-55,573	-55,573					-55,573		0
Redeemable noncontrolling interests, other comprehensive loss, net of tax										-407
Stock-based compensation expense	17,878	17,878			17,878				0	1,033
Stock Issued During Period, Shares, New Issues			729
Issuance of common stock upon exercise of stock options, vesting of restricted stock units and other, net of withholding taxes	-10,387	-10,387	1		-10,388
Income tax benefit related to the exercise of stock options, vesting of restricted stock units and other	16,838	16,838			16,838
Dividends	-28,675	-28,675			0	-28,675
Purchase of treasury stock	-200,000	-200,000						-200,000
Purchase of redeemable noncontrolling interests										-15,338
Adjustment of redeemable noncontrolling interests to fair value	-5,725	-5,725			-5,725				0	5,725
Noncontrolling Interest, Transfer to Redeemable Noncontrolling Interest	-1,189								-1,189	1,189
Redeemable noncontrolling interests, other										-83
Redeemable noncontrolling interests, balance at Mar. 31, 2015	28,295									28,295
Balance at Mar. 31, 2015	$1,752,714	$1,752,714	$253	$16	$11,434,220	$322,848	($143,273)	($9,861,350)	$0
Balance (in shares) at Mar. 31, 2015			252,899	16,157

CONSOLIDATED_STATEMENT_OF_CASH

CONSOLIDATED STATEMENT OF CASH FLOWS (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities attributable to continuing operations:
Net earnings	$21,988	$33,491
Earnings (loss) from discontinued operations, net of tax	125	-814
Earnings from continuing operations	21,863	34,305
Adjustments to reconcile earnings from continuing operations to net cash (used in) provided by operating activities attributable to continuing operations:
Stock-based compensation expense	18,911	9,613
Depreciation	15,568	14,818
Amortization of intangibles	12,555	11,979
Excess Tax Benefits from stock-based awards	-16,846	-24,203
Deferred income taxes	867	3,799
Equity in losses of unconsolidated affiliates	283	1,935
Acquisition-related contingent consideration fair value adjustments	-6,996	-27
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	-3,847	-20,387
Other assets	6,775	-4,100
Accounts payable and other current liabilities	-33,420	-11,655
Income taxes payable	-41,359	6,697
Deferred revenue	23,001	16,917
Other Operating Activities, Cash Flow Statement	-689	-1,035
Other changes in assets and liabilities, net	-476	3,985
Net cash (used in) provided by operating activities attributable to continuing operations	-3,810	42,641
Cash flows from investing activities attributable to continuing operations:
Acquisitions, net of cash acquired	-5,709	-77,981
Capital expenditures	-12,876	-9,721
Proceeds from maturities and sales of marketable debt securities	6,050	0
Purchases of marketable debt securities	-47,930	-32,848
Purchases of long-term investments	-8,345	-7,861
Other, net	2,843	-157
Net cash used in investing activities attributable to continuing operations	-65,967	-128,568
Cash flows from financing activities attributable to continuing operations:
Purchase of treasury stock	-200,000	0
Dividends	-28,675	-20,004
Issuance of common stock, net of withholding taxes	-10,339	920
Excess tax benefits from stock-based awards	16,846	24,203
Purchase of noncontrolling interests	-15,338	-30,000
Funds returned from escrow for Meetic tender offer	0	12,354
Acquisition-related contingent consideration payment	-180	0
Other, net	110	-295
Net cash used in financing activities attributable to continuing operations	-237,576	-12,822
Total cash used in continuing operations	-307,353	-98,749
Effect of exchange rate changes on cash and cash equivalents	-11,455	1,616
Net decrease in cash and cash equivalents	-318,808	-97,133
Cash and cash equivalents at beginning of period	990,405	1,100,444
Cash and cash equivalents at end of period	$671,597	$1,003,311

THE_COMPANY_AND_SUMMARY_OF_SIG

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Nature of Operations
	IAC is a leading media and Internet company. The Company is organized into four segments: The Match Group, which consists of dating, education and fitness businesses with brands such as Match, OkCupid, Tinder, The Princeton Review and DailyBurn; Search & Applications, which includes brands such as About.com, Ask.com, Dictionary.com and Investopedia; Media, which includes businesses such as Vimeo, Electus, The Daily Beast and CollegeHumor; and eCommerce, which includes HomeAdvisor and ShoeBuy. IAC's brands and products are among the most recognized in the world, reaching users in over 200 countries.
	All references to "IAC," the "Company," "we," "our" or "us" in this report are to IAC/InterActiveCorp.
	Basis of Presentation
	The Company prepares its consolidated financial statements in accordance with U.S. generally accepted accounting principles ("GAAP").
	Basis of Consolidation and Accounting for Investments
	The consolidated financial statements include the accounts of the Company, all entities that are wholly-owned by the Company and all entities in which the Company has a controlling financial interest. Intercompany transactions and accounts have been eliminated.
	Investments in the common stock or in-substance common stock of entities in which the Company has the ability to exercise significant influence over the operating and financial matters of the investee, but does not have a controlling financial interest, are accounted for using the equity method and are included in "Long-term investments" in the accompanying consolidated balance sheet.
	The accompanying unaudited consolidated financial statements have been prepared in accordance with GAAP for interim financial information and with the rules and regulations of the Securities and Exchange Commission. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, the accompanying unaudited consolidated financial statements include all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation. Interim results are not necessarily indicative of the results that may be expected for the full year. The accompanying unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2014.
	Accounting Estimates
	The preparation of consolidated financial statements in accordance with GAAP requires management to make certain estimates, judgments and assumptions that impact the reported amounts of assets, liabilities, revenue and expenses and the related disclosure of contingent assets and liabilities. Actual results could differ from these estimates.
	On an ongoing basis, the Company evaluates its estimates and judgments including those related to: the fair values of marketable securities and other investments; the recoverability of goodwill and indefinite-lived intangible assets; the useful lives and recovery of definite-lived intangible assets and property and equipment; the carrying value of accounts receivable, including the determination of the allowance for doubtful accounts and revenue reserves; the fair value of acquisition-related contingent consideration; the liabilities for uncertain tax positions; the valuation allowance for deferred income tax assets; and the fair value of and forfeiture rates for stock-based awards, among others. The Company bases its estimates and judgments on historical experience, its forecasts and budgets and other factors that the Company considers relevant.
	Certain Risks and Concentrations
	A substantial portion of the Company's revenue is derived from online advertising, the market for which is highly competitive and rapidly changing. Significant changes in this industry or changes in advertising spending behavior or in customer buying behavior could adversely affect our operating results. Most of the Company's online advertising revenue is attributable to a services agreement with Google Inc. ("Google"), which expires on March 31, 2016. Our services agreement requires that we comply with certain guidelines promulgated by Google. Subject to certain limitations, Google may unilaterally update its policies and guidelines, which could require modifications to, or prohibit and/or render obsolete certain of our products, services and/or business practices, which could be costly to address or otherwise have an adverse effect on our business, financial condition and results of operations. For the three months ended March 31, 2015 and 2014, revenue earned from Google is $339.6 million and $355.6 million, respectively. This revenue is earned by the businesses comprising the Search & Applications segment. Accounts receivable related to revenue earned from Google totaled $111.7 million and $118.7 million at March 31, 2015 and December 31, 2014, respectively.
	Recent Accounting Pronouncement
	In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers, which clarifies the principles for recognizing revenue and develops a common standard for all industries. The new guidance is effective for reporting periods beginning after December 15, 2016. Entities have the option of using either a full retrospective or cumulative effect approach to adopt ASU No. 2014-09. In April 2015, the FASB announced a proposal to defer the effective date by one year, with early adoption on the original effective date permitted. The Company is currently evaluating the new guidance and has not yet determined whether the adoption of the new standard will have a material impact on its consolidated financial statements or the method and timing of adoption.
	Reclassifications
	Certain prior year amounts have been reclassified to conform to the current year presentation.

INCOME_TAXES

INCOME TAXES	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES
	At the end of each interim period, the Company makes its best estimate of the annual expected effective income tax rate and applies that rate to its ordinary year-to-date earnings or loss. The income tax provision or benefit related to significant, unusual, or extraordinary items, if applicable, that will be separately reported or reported net of their related tax effects are individually computed and recognized in the interim period in which they occur. In addition, the effect of changes in enacted tax laws or rates, tax status, judgment on the realizability of a beginning-of-the-year deferred tax asset in future years or the liabilities for uncertain tax positions is recognized in the interim period in which the change occurs.
	The computation of the annual expected effective income tax rate at each interim period requires certain estimates and assumptions including, but not limited to, the expected pre-tax income (or loss) for the year, projections of the proportion of income (and/or loss) earned and taxed in foreign jurisdictions, permanent and temporary differences, and the likelihood of the realization of deferred tax assets generated in the current year. The accounting estimates used to compute the provision or benefit for income taxes may change as new events occur, more experience is acquired, additional information is obtained or our tax environment changes. To the extent that the expected annual effective income tax rate changes during a quarter, the effect of the change on prior quarters is included in income tax provision in the quarter in which the change occurs.
	For the three months ended March 31, 2015, the Company recorded an income tax provision for continuing operations of $6.2 million, which represents an effective income tax rate of 22%. The effective rate for the three months ended March 31, 2015 is lower than the statutory rate of 35% due principally to the non-taxable gain on contingent consideration fair value adjustments in the current year period and a reduction in tax reserves and related interest due to the expiration of statutes of limitations. For the three months ended March 31, 2014, the Company recorded an income tax provision for continuing operations of $21.4 million, which represents an effective income tax rate of 38%. The effective rate for the three months ended March 31, 2014 is higher than the statutory rate of 35% due primarily to interest on reserves for income tax contingencies and state taxes, partially offset by foreign income taxed at lower rates.
	The Company recognizes interest and, if applicable, penalties related to unrecognized tax benefits in the income tax provision. Included in the income tax provision for continuing operations for the three months ended March 31, 2015 and 2014, is a $0.1 million benefit and a $1.6 million provision, respectively, net of related deferred taxes, for interest on unrecognized tax benefits. At March 31, 2015 and December 31, 2014, the Company has accrued $2.5 million and $2.8 million, respectively, for the payment of interest. At March 31, 2015 and December 31, 2014, the Company has accrued $2.3 million and $2.9 million, respectively, for penalties.
	The Company is routinely under audit by federal, state, local and foreign authorities in the area of income tax. These audits include questioning the timing and the amount of income and deductions and the allocation of income and deductions among various tax jurisdictions. The Internal Revenue Service is currently auditing the Company’s federal income tax returns for the years ended December 31, 2010 through 2012. Various other jurisdictions are open to examination for various tax years beginning with 2009. Income taxes payable include reserves considered sufficient to pay assessments that may result from examination of prior year tax returns. Changes to reserves from period to period and differences between amounts paid, if any, upon resolution of audits and amounts previously provided may be material. Differences between the reserves for uncertain tax positions and the amounts owed by the Company are recorded in the period they become known.
	At March 31, 2015 and December 31, 2014, unrecognized tax benefits, including interest, are $30.4 million and $33.2 million, respectively. If unrecognized tax benefits at March 31, 2015 are subsequently recognized, $28.1 million, net of related deferred tax assets and interest, would reduce income tax provision for continuing operations. The Company believes that it is reasonably possible that its unrecognized tax benefits could decrease by $7.8 million within twelve months of March 31, 2015 primarily due to expirations of statutes of limitations; $7.4 million of which would reduce the income tax provision for continuing operations.

MARKETABLE_SECURITIES

MARKETABLE SECURITIES	3 Months Ended
	Mar. 31, 2015
Marketable Securities [Abstract]
MARKETABLE SECURITIES	MARKETABLE SECURITIES
	At March 31, 2015, current available-for-sale marketable securities are as follows:
		Amortized		Gross		Gross			Fair
		Cost		Unrealized		Unrealized			Value
				Gains		Losses
		(In thousands)
	Corporate debt securities	$	204,450	$	310	$	(60	)	$	204,700
	Equity security	98		823		—			921
	Total marketable securities	$	204,548	$	1,133	$	(60	)	$	205,621
	All of the Company’s marketable debt securities are rated investment grade. The gross unrealized losses on the marketable debt securities relate principally to changes in interest rates. Because the Company does not intend to sell any marketable debt securities and it is not more likely than not that the Company will be required to sell any marketable debt securities before recovery of their amortized cost bases, which may be maturity, the Company does not consider any of its marketable debt securities to be other-than-temporarily impaired at March 31, 2015.
	At December 31, 2014, current available-for-sale marketable securities are as follows:
		Amortized		Gross		Gross			Fair
		Cost		Unrealized		Unrealized			Value
				Gains		Losses
		(In thousands)
	Corporate debt securities	$	159,418	$	34	$	(255	)	$	159,197
	Equity security	98		1,353		—			1,451
	Total marketable securities	$	159,516	$	1,387	$	(255	)	$	160,648
	The unrealized gains and losses in the tables above are included in "Accumulated other comprehensive loss" in the accompanying consolidated balance sheet.
	The contractual maturities of debt securities classified as current available-for-sale at March 31, 2015 are as follows:
		Amortized		Fair
		Cost		Value
		(In thousands)
	Due in one year or less	$	69,218	$	69,220
	Due after one year through five years	135,232		135,480
	Total	$	204,450	$	204,700
	The following table presents the proceeds from maturities and sales of current and non-current available-for-sale marketable securities:
		Three Months Ended March 31,
		2015		2014
		(In thousands)
	Proceeds from maturities and sales of available-for-sale marketable securities	$	6,050	$	—
	There were no gross realized gains or losses from the maturities and sales of available-for-sale marketable securities for the three months ended March 31, 2015 and 2014.
	The specific-identification method is used to determine the cost of securities sold and the amount of unrealized gains and losses reclassified out of accumulated other comprehensive income into earnings.

FAIR_VALUE_MEASUREMENTS_AND_FI

FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS
	The Company categorizes its financial instruments measured at fair value into a fair value hierarchy that prioritizes the inputs used in pricing the asset or liability. The three levels of the fair value hierarchy are:
	•	Level 1: Observable inputs obtained from independent sources, such as quoted prices for identical assets and liabilities in active markets.
	•	Level 2: Other inputs, which are observable directly or indirectly, such as quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active and inputs that are derived principally from or corroborated by observable market data. The fair values of the Company's Level 2 financial assets are primarily obtained from observable market prices for identical underlying securities that may not be actively traded. Certain of these securities may have different market prices from multiple market data sources, in which case an average market price is used.
	•	Level 3: Unobservable inputs for which there is little or no market data and require the Company to develop its own assumptions, based on the best information available in the circumstances, about the assumptions market participants would use in pricing the assets or liabilities. See below for a discussion of fair value measurements made using Level 3 inputs.
	The following tables present the Company's financial instruments that are measured at fair value on a recurring basis:
		March 31, 2015
		Quoted Market			Significant			Significant			Total
		Prices in Active			Other			Unobservable			Fair Value
		Markets for			Observable			Inputs			Measurements
		Identical Assets			Inputs			(Level 3)
		(Level 1)			(Level 2)
		(In thousands)
	Assets:
	Cash equivalents:
	Money market funds	$	107,661		$	—		$	—		$	107,661
	Commercial paper	—			204,236			—			204,236
	Time deposits	—			34,004			—			34,004
	Marketable securities:
	Corporate debt securities	—			204,700			—			204,700
	Equity security	921			—			—			921
	Long-term investments:
	Auction rate security	—			—			6,190			6,190
	Marketable equity security	7,924			—			—			7,924
	Total	$	116,506		$	442,940		$	6,190		$	565,636
	Liabilities:
	Contingent consideration arrangements	$	—		$	—		$	(20,964	)	$	(20,964	)
		December 31, 2014
		Quoted Market			Significant			Significant			Total
		Prices in Active			Other			Unobservable			Fair Value
		Markets for			Observable			Inputs			Measurements
		Identical Assets			Inputs			(Level 3)
		(Level 1)			(Level 2)
		(In thousands)
	Assets:
	Cash equivalents:
	Money market funds	$	174,720		$	—		$	—		$	174,720
	Commercial paper	—			388,801			—			388,801
	Time deposits	—			42,914			—			42,914
	Marketable securities:
	Corporate debt securities	—			159,197			—			159,197
	Equity security	1,451			—			—			1,451
	Long-term investments:
	Auction rate security	—			—			6,070			6,070
	Marketable equity security	7,410			—			—			7,410
	Total	$	183,581		$	590,912		$	6,070		$	780,563
	Liabilities:
	Contingent consideration arrangements	$	—		$	—		$	(30,140	)	$	(30,140	)
	The following table presents the changes in the Company's financial instruments that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3):
		Three Months Ended March 31,
		2015						2014
		Auction Rate			Contingent			Auction Rate			Contingent
		Security			Consideration			Security			Consideration
					Arrangements						Arrangements
		(In thousands)
	Balance at January 1	$	6,070		$	(30,140	)	$	8,920		$	(45,828	)
	Total net gains (losses):
	Included in earnings	—			7,626			—			27
	Included in other comprehensive income (loss)	120			1,733			230			(363		)
	Fair value at date of acquisition	—			(363		)	—			(2,835		)
	Settlements	—			180			—			241
	Balance at March 31	$	6,190		$	(20,964	)	$	9,150		$	(48,758	)
	Auction rate security
	The Company's auction rate security is valued by discounting the estimated future cash flow streams of the security over the life of the security. Credit spreads and other risk factors are also considered in establishing fair value. The cost basis of the auction rate security is $10.0 million, with gross unrealized losses of $3.8 million and $3.9 million at March 31, 2015 and December 31, 2014, respectively. The unrealized losses are included in "Accumulated other comprehensive loss" in the accompanying consolidated balance sheet. At March 31, 2015, the auction rate security is rated BBB- and matures in 2035. The Company does not consider the auction rate security to be other-than-temporarily impaired at March 31, 2015, due to its credit rating and because the Company does not intend to sell this security, and it is not more likely than not that the Company will be required to sell this security, before the recovery of its amortized cost basis, which may be maturity.
Contingent Consideration Arrangements
As of March 31, 2015, there are nine contingent consideration arrangements related to business acquisitions. Eight of the contingent consideration arrangements have limits as to the maximum amount that can be paid; the maximum contingent payments related to these arrangements is $189.0 million and the fair value of these arrangements at March 31, 2015 is $20.5 million. The fair value of the one contingent consideration arrangement without a limit on the maximum amount is $0.5 million at March 31, 2015. The contingent consideration arrangements are generally based upon earnings performance and/or operating metrics such as monthly average users. The Company typically determines the fair value of the contingent consideration arrangements by using a probability-weighted analysis to determine the amount of the gross liability, and, if the arrangement is long-term in nature, applying a discount rate that captures the risks associated with the obligation. The number of scenarios in the probability-weighted analyses can vary; generally, more scenarios are prepared for longer duration and more complex arrangements. The contingent consideration arrangements fair values at March 31, 2015 reflect discount rates ranging from 15-25%.
The fair values of the contingent consideration arrangements are sensitive to changes in the forecasts of earnings and/or the relevant operating metrics and changes in discount rates. The Company remeasures the fair value of the contingent consideration arrangements each reporting period, and changes are recognized in “General and administrative expense” in the accompanying consolidated statement of operations. The contingent consideration arrangement liability at March 31, 2015 includes a current portion of $11.7 million and non-current portion of $9.2 million, which are included in “Accrued expenses and other current liabilities” and “Other long-term liabilities,” respectively, in the accompanying consolidated balance sheet.
Assets measured at fair value on a nonrecurring basis
The Company's non-financial assets, such as goodwill, intangible assets and property and equipment, as well as equity and cost method investments, are adjusted to fair value only when an impairment charge is recognized. Such fair value measurements are based predominantly on Level 3 inputs.
Cost method investments
At March 31, 2015 and December 31, 2014, the carrying values of the Company's investments accounted for under the cost method totaled $99.3 million and $90.9 million, respectively, and are included in "Long-term investments" in the accompanying consolidated balance sheet. The Company evaluates each cost method investment for impairment on a quarterly basis and recognizes an impairment loss if a decline in value is determined to be other-than-temporary. If the Company has not identified events or changes in circumstances that may have a significant adverse effect on the fair value of a cost method investment, then the fair value of such cost method investment is not estimated, as it is impracticable to do so.
Long-term marketable equity securities
The cost basis of the Company's long-term marketable equity security at March 31, 2015 and December 31, 2014 is $8.7 million, with gross unrealized losses of $0.7 million and $1.2 million, respectively. The gross unrealized losses at March 31, 2015 and December 31, 2014 are included in "Accumulated other comprehensive loss" in the accompanying consolidated balance sheet.
Financial instruments measured at fair value only for disclosure purposes
The following table presents the carrying value and the fair value of financial instruments measured at fair value only for disclosure purposes:
	31-Mar-15						31-Dec-14
	Carrying			Fair			Carrying			Fair
	Value			Value			Value			Value
	(In thousands)
Long-term debt	$	(1,080,000	)	$	(1,100,002	)	$	(1,080,000	)	$	(1,099,813	)
The fair value of long-term debt is estimated using market prices or indices for similar liabilities and taking into consideration other factors such as credit quality and maturity, which are Level 3 inputs.

LONGTERM_DEBT

LONG-TERM DEBT	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT
	Long-term debt consists of:
		31-Mar-15		31-Dec-14
		(In thousands)
	4.875% Senior Notes due November 30, 2018 (the "2013 Senior Notes"); interest payable each May 30 and November 30, which commenced May 30, 2014	$	500,000	$	500,000
	4.75% Senior Notes due December 15, 2022 (the "2012 Senior Notes"); interest payable each June 15 and December 15, which commenced June 15, 2013	500,000		500,000
	5% New York City Industrial Development Agency Liberty Bonds due September 1, 2035; interest payable each March 1 and September 1, which commenced March 1, 2006	80,000		80,000
	Total long-term debt	$	1,080,000	$	1,080,000
	The 2013 and 2012 Senior Notes were issued on November 15, 2013 and December 21, 2012, respectively. On December 21, 2012, the Company entered into a $300 million revolving credit facility, which expires on December 21, 2017. The annual fee to maintain the revolving credit facility is 30 basis points. At March 31, 2015 and December 31, 2014, there are no outstanding borrowings under the revolving credit facility.
	The 2013 and 2012 Senior Notes are unconditionally guaranteed by certain domestic subsidiaries, which are designated as guarantor subsidiaries. The guarantor subsidiaries are the same for the 2013 and 2012 Senior Notes and IAC's obligation under the revolving credit facility; IAC's obligation under the revolving credit facility is also secured by the stock of certain of our domestic and foreign subsidiaries. See Note 10 for guarantor and non-guarantor financial information.
	The indentures governing the 2013 and 2012 Senior Notes restrict our ability to incur additional indebtedness in the event we are not in compliance with the maximum leverage ratio of 3.0 to 1.0. In addition, the terms of the revolving credit facility require that we maintain a leverage ratio of not more than 3.0 to 1.0 and restrict our ability to incur additional indebtedness. As of March 31, 2015, the Company was in compliance with all of these covenants.

ACCUMULATED_OTHER_COMPREHENSIV

ACCUMULATED OTHER COMPREHENSIVE LOSS	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
ACCUMULATED OTHER COMPREHENSIVE LOSS	ACCUMULATED OTHER COMPREHENSIVE LOSS
	The following tables present the components of accumulated other comprehensive (loss) income. There have been no amounts reclassified out of accumulated other comprehensive loss into earnings for the three months ended March 31, 2015 and 2014.
		Three Months Ended March 31, 2015
		Foreign Currency Translation Adjustment			Unrealized (Losses) Gains On Available-For-Sale Securities			Accumulated Other Comprehensive Loss
		(In thousands)
	Balance as of December 31	$	(86,848	)	$	(852	)	$	(87,700	)
	Other comprehensive (loss) income, net of tax provision of $0.1 million related to unrealized gains on available-for-sale securities	(56,334		)	761			(55,573		)
	Balance as of March 31	$	(143,182	)	$	(91	)	$	(143,273	)
		Three Months Ended March 31, 2014
		Foreign Currency Translation Adjustment			Unrealized Gains On Available-For-Sale Securities			Accumulated Other Comprehensive (Loss) Income
		(In thousands)
	Balance as of December 31	$	(20,352	)	$	7,306		$	(13,046	)
	Other comprehensive income, net of tax provision of $0.6 million related to unrealized gains on available-for-sale securities	5,220			129			5,349
	Balance as of March 31	$	(15,132	)	$	7,435		$	(7,697	)

EARNINGS_PER_SHARE

EARNINGS PER SHARE	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE
	The following table sets forth the computation of basic and diluted earnings per share attributable to IAC shareholders.
		Three Months Ended March 31,
		2015				2014
		Basic		Diluted		Basic			Diluted
		(In thousands, except per share data)
	Numerator:
	Earnings from continuing operations	$	21,863	$	21,863	$	34,305		$	34,305
	Net loss attributable to noncontrolling interests	4,417		4,417		2,394			2,394
	Earnings from continuing operations attributable to IAC shareholders	26,280		26,280		36,699			36,699
	Earnings (loss) from discontinued operations attributable to IAC shareholders	125		125		(814		)	(814		)
	Net earnings attributable to IAC shareholders	$	26,405	$	26,405	$	35,885		$	35,885
	Denominator:
	Weighted average basic shares outstanding	83,453		83,453		82,484			82,484
	Dilutive securities including stock options and RSUs(a)	—		5,305		—			4,720
	Denominator for earnings per share—weighted average shares(a)	83,453		88,758		82,484			87,204
	Earnings per share attributable to IAC shareholders:
	Earnings per share from continuing operations	$	0.31	$	0.3	$	0.44		$	0.42
	Discontinued operations	0.01		—		—			(0.01		)
	Earnings per share	$	0.32	$	0.3	$	0.44		$	0.41
	_________________________________________
	(a) If the effect is dilutive, weighted average common shares outstanding include the incremental shares that would be issued upon the assumed exercise of stock options and vesting of restricted stock units ("RSUs"). For the three months ended March 31, 2015 approximately 2.0 million shares related to potentially dilutive securities are excluded from the calculation of diluted earnings per share because their inclusion would have been anti-dilutive. For the three months ended March 31, 2014, there are no securities that are excluded from the calculation of diluted earnings per share.

SEGMENT_INFORMATION

SEGMENT INFORMATION	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION
	The overall concept that IAC employs in determining its operating segments is to present the financial information in a manner consistent with how the chief operating decision maker views the businesses, how the businesses are organized as to segment management, and the focus of the businesses with regards to the types of services or products offered or the target market. Operating segments are combined for reporting purposes if they meet certain aggregation criteria, which principally relate to the similarity of their economic characteristics or, in the case of the eCommerce reportable segment, do not meet the quantitative thresholds that require presentation as separate operating segments.
		Three Months Ended March 31,
		2015			2014
		(In thousands)
	Revenue:
	Search & Applications	$	382,898		$	398,035
	The Match Group	239,211			211,187
	Media	43,612			36,355
	eCommerce	107,010			94,842
	Inter-segment elimination	(219		)	(172		)
	Total	$	772,512		$	740,247
		Three Months Ended March 31,
		2015			2014
		(In thousands)
	Operating Income (Loss):
	Search & Applications	$	64,300		$	70,337
	The Match Group	25,312			39,803
	Media	(15,352		)	(8,566		)
	eCommerce	(6,854		)	(1,561		)
	Corporate	(32,287		)	(28,301		)
	Total	$	35,119		$	71,712
		Three Months Ended March 31,
		2015			2014
		(In thousands)
	Adjusted EBITDA:
	Search & Applications	$	78,901		$	82,071
	The Match Group	25,856			47,430
	Media	(14,583		)	(7,864		)
	eCommerce	(3,137		)	2,804
	Corporate	(11,880		)	(16,346		)
	Total	$	75,157		$	108,095
	Revenue by geography is based on where the customer is located. Geographic information about revenue and long-lived assets is presented below:
		Three Months Ended March 31,
		2015			2014
		(In thousands)
	Revenue:
	United States	$	570,013		$	504,403
	All other countries	202,499			235,844
	Total	$	772,512		$	740,247
		March 31,			December 31,
		2015			2014
		(In thousands)
	Long-lived assets (excluding goodwill and intangible assets):
	United States	$	279,606		$	281,879
	All other countries	18,350			20,580
	Total	$	297,956		$	302,459
	The Company's primary financial measure is Adjusted EBITDA, which is defined as operating income excluding: (1) stock-based compensation expense; (2) depreciation; and (3) acquisition-related items consisting of (i) amortization of intangible assets and goodwill and intangible asset impairments and (ii) gains and losses recognized on changes in the fair value of contingent consideration arrangements. The Company believes this measure is useful for analysts and investors as this measure allows a more meaningful comparison between our performance and that of our competitors. Moreover, our management uses this measure internally to evaluate the performance of our business as a whole and our individual business segments. The above items are excluded from our Adjusted EBITDA measure because these items are non-cash in nature, and we believe that by excluding these items, Adjusted EBITDA corresponds more closely to the cash operating income generated from our business, from which capital investments are made and debt is serviced. Adjusted EBITDA has certain limitations in that it does not take into account the impact to IAC's statement of operations of certain expenses.
	The following tables reconcile Adjusted EBITDA to operating income (loss) for the Company's reportable segments:
		Three Months Ended March 31, 2015
		Adjusted			Stock-Based			Depreciation			Amortization			Acquisition-related Contingent Consideration Fair Value Adjustments			Operating
		EBITDA			Compensation						of Intangibles						Income
					Expense												(Loss)
		(In thousands)
	Search & Applications	$	78,901		$	—		$	(3,616	)	$	(6,965	)	$	(4,020	)	$	64,300
	The Match Group	25,856			(613		)	(7,065		)	(3,877		)	11,011			25,312
	Media	(14,583		)	(147		)	(204		)	(423		)	5			(15,352		)
	eCommerce	(3,137		)	(420		)	(2,007		)	(1,290		)	—			(6,854		)
	Corporate	(11,880		)	(17,731		)	(2,676		)	—			—			(32,287		)
	Total	$	75,157		$	(18,911	)	$	(15,568	)	$	(12,555	)	$	6,996		$	35,119
		Three Months Ended March 31, 2014
		Adjusted			Stock-Based			Depreciation			Amortization			Acquisition-related Contingent Consideration Fair Value Adjustments			Operating
		EBITDA			Compensation						of Intangibles						Income
					Expense												(Loss)
	(In thousands)
Search & Applications	$	82,071		$	—		$	(4,465	)	$	(7,269	)	$	—		$	70,337
The Match Group	47,430			(17		)	(5,800		)	(1,837		)	27			39,803
Media	(7,864		)	(164		)	(282		)	(256		)	—			(8,566		)
eCommerce	2,804			—			(1,748		)	(2,617		)	—			(1,561		)
Corporate	(16,346		)	(9,432		)	(2,523		)	—			—			(28,301		)
Total	$	108,095		$	(9,613	)	$	(14,818	)	$	(11,979	)	$	27		$	71,712

CONTINGENCIES

CONTINGENCIES	3 Months Ended
	Mar. 31, 2015
Loss Contingency [Abstract]
CONTINGENCIES	CONTINGENCIES
	In the ordinary course of business, the Company is a party to various lawsuits. The Company establishes reserves for specific legal matters when it determines that the likelihood of an unfavorable outcome is probable and the loss is reasonably estimable. Management has also identified certain other legal matters where we believe an unfavorable outcome is not probable and, therefore, no reserve is established. Although management currently believes that resolving claims against us, including claims where an unfavorable outcome is reasonably possible, will not have a material impact on the liquidity, results of operations, or financial condition of the Company, these matters are subject to inherent uncertainties and management's view of these matters may change in the future. The Company also evaluates other contingent matters, including income and non-income tax contingencies, to assess the likelihood of an unfavorable outcome and estimated extent of potential loss. It is possible that an unfavorable outcome of one or more of these lawsuits or other contingencies could have a material impact on the liquidity, results of operations, or financial condition of the Company. See Note 2 for additional information related to income tax contingencies.

GUARANTOR_AND_NONGUARANTOR_FIN

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION	3 Months Ended
	Mar. 31, 2015
Guarantor and Nonguarantor Financial Statements [Abstract]
GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION	GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION
	The 2013 and 2012 Senior Notes are unconditionally guaranteed, jointly and severally, by certain domestic subsidiaries which are 100% owned by the Company. The following tables present condensed consolidating financial information at March 31, 2015 and December 31, 2014 and for the three months ended March 31, 2015 and 2014 for: IAC, on a stand-alone basis; the combined guarantor subsidiaries of IAC; the combined non-guarantor subsidiaries of IAC; and IAC on a consolidated basis.
	Balance sheet at March 31, 2015:
		IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Total Eliminations			IAC Consolidated
		(In thousands)
	Cash and cash equivalents	$	468,857		$	—		$	202,740		$	—		$	671,597
	Marketable securities	204,700			—			921			—			205,621
	Accounts receivable, net	17			156,409			76,038			—			232,464
	Other current assets	41,743			93,861			54,186			(5,529		)	184,261
	Intercompany receivables	—			1,732,085			982,713			(2,714,798		)	—
	Property and equipment, net	5,511			229,513			62,932			—			297,956
	Goodwill	—			1,250,200			470,701			—			1,720,901
	Intangible assets, net	—			319,502			150,050			—			469,552
	Investment in subsidiaries	5,056,128			916,116			—			(5,972,244		)	—
	Other non-current assets	44,460			21,042			112,382			(2,131		)	175,753
	Total assets	$	5,821,416		$	4,718,728		$	2,112,663		$	(8,694,702	)	$	3,958,105
	Accounts payable, trade	$	3,954		$	56,934		$	22,558		$	—		$	83,446
	Other current liabilities	44,152			318,375			180,402			(623		)	542,306
	Long-term debt	1,000,000			80,000			—			—			1,080,000
	Income taxes payable	909			4,777			23,614			—			29,300
	Intercompany liabilities	2,714,798			—			—			(2,714,798		)	—
	Other long-term liabilities	304,889			104,257			39,935			(7,037		)	442,044
	Redeemable noncontrolling interests	—			—			28,295			—			28,295
	IAC shareholders' equity	1,752,714			4,154,385			1,817,859			(5,972,244		)	1,752,714
	Total liabilities and shareholders' equity	$	5,821,416		$	4,718,728		$	2,112,663		$	(8,694,702	)	$	3,958,105
	Balance sheet at December 31, 2014:
		IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Total Eliminations			IAC Consolidated
		(In thousands)
	Cash and cash equivalents	$	766,076		$	1,021		$	223,308		$	—		$	990,405
	Marketable securities	159,197			—			1,451			—			160,648
	Accounts receivable, net	13			155,262			80,811			—			236,086
	Other current assets	23,923			91,105			57,487			(5,773		)	166,742
	Intercompany receivables	—			1,688,403			970,810			(2,659,213		)	—
	Property and equipment, net	4,950			232,819			64,690			—			302,459
	Goodwill	—			1,249,807			505,119			—			1,754,926
	Intangible assets, net	—			325,771			166,165			—			491,936
	Investment in subsidiaries	5,035,304			930,443			—			(5,965,747		)	—
	Other non-current assets	44,610			20,682			109,372			(2,988		)	171,676
	Total assets	$	6,034,073		$	4,695,313		$	2,179,213		$	(8,633,721	)	$	4,274,878
	Accounts payable, trade	$	3,059		$	55,320		$	22,784		$	—		$	81,163
	Other current liabilities	73,491			328,920			191,197			(817		)	592,791
	Long-term debt	1,000,000			80,000			—			—			1,080,000
	Income taxes payable	2,240			4,771			25,624			—			32,635
	Intercompany liabilities	2,659,213			—			—			(2,659,213		)	—
	Other long-term liabilities	304,117			104,219			54,328			(7,944		)	454,720
	Redeemable noncontrolling interests	—			—			40,427			—			40,427
	IAC shareholders' equity	1,991,953			4,122,083			1,843,664			(5,965,747		)	1,991,953
	Noncontrolling interests	—			—			1,189			—			1,189
	Total liabilities and shareholders' equity	$	6,034,073		$	4,695,313		$	2,179,213		$	(8,633,721	)	$	4,274,878
	Statement of operations for the three months ended March 31, 2015:
		IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Total Eliminations			IAC Consolidated
		(In thousands)
	Revenue	$	—		$	594,801		$	180,360		$	(2,649	)	$	772,512
	Operating costs and expenses:
	Cost of revenue (exclusive of depreciation shown separately below)	245			119,741			71,764			(197		)	191,553
	Selling and marketing expense	1,055			288,625			70,396			(2,410		)	357,666
	General and administrative expense	24,064			65,753			25,019			(42		)	114,794
	Product development expense	2,177			31,134			11,946			—			45,257
	Depreciation	401			11,580			3,587			—			15,568
	Amortization of intangibles	—			6,270			6,285			—			12,555
	Total operating costs and expenses	27,942			523,103			188,997			(2,649		)	737,393
	Operating (loss) income	(27,942		)	71,698			(8,637		)	—			35,119
	Equity in earnings of unconsolidated affiliates	54,124			3,696			—			(57,820		)	—
	Interest expense	(12,990		)	(1,046		)	(28		)	—			(14,064		)
Other (expense) income, net	(9,353		)	11,392			4,949			—			6,988
Earnings (loss) from continuing operations before income taxes	3,839			85,740			(3,716		)	(57,820		)	28,043
Income tax benefit (provision)	22,441			(31,796		)	3,175			—			(6,180		)
Earnings (loss) from continuing operations	26,280			53,944			(541		)	(57,820		)	21,863
Earnings from discontinued operations, net of tax	125			—			—			—			125
Net earnings (loss)	26,405			53,944			(541		)	(57,820		)	21,988
Net loss attributable to noncontrolling interests	—			—			4,417			—			4,417
Net earnings attributable to IAC shareholders	$	26,405		$	53,944		$	3,876		$	(57,820	)	$	26,405
Comprehensive (loss) income attributable to IAC shareholders	$	(29,168	)	$	48,159		$	(52,868	)	$	4,709		$	(29,168	)
Statement of operations for the three months ended March 31, 2014:
	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Total Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	546,326		$	196,907		$	(2,986	)	$	740,247
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	(28		)	129,301			80,921			(960		)	209,234
Selling and marketing expense	192			236,341			63,764			(1,698		)	298,599
General and administrative expense	22,446			45,675			26,955			13			95,089
Product development expense	1,471			27,096			10,590			(341		)	38,816
Depreciation	329			9,561			4,928			—			14,818
Amortization of intangibles	—			9,001			2,978			—			11,979
Total operating costs and expenses	24,410			456,975			190,136			(2,986		)	668,535
Operating (loss) income	(24,410		)	89,351			6,771			—			71,712
Equity in earnings of unconsolidated affiliates	54,297			932			—			(55,229		)	—
Interest expense	(12,985		)	(1,042		)	(37		)	—			(14,064		)
Other income (expense), net	9,685			(10,527		)	(1,116		)	—			(1,958		)
Earnings from continuing operations before income taxes	26,587			78,714			5,618			(55,229		)	55,690
Income tax benefit (provision)	10,112			(29,944		)	(1,553		)	—			(21,385		)
Earnings from continuing operations	36,699			48,770			4,065			(55,229		)	34,305
Loss from discontinued operations, net of tax	(814		)	—			(13		)	13			(814		)
Net earnings	35,885			48,770			4,052			(55,216		)	33,491
Net loss attributable to noncontrolling interests	—			—			2,394			—			2,394
Net earnings attributable to IAC shareholders	$	35,885		$	48,770		$	6,446		$	(55,216	)	$	35,885
Comprehensive income attributable to IAC shareholders	$	41,234		$	49,153		$	10,115		$	(59,268	)	$	41,234
Statement of cash flows for the three months ended March 31, 2015:
	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			IAC Consolidated
	(In thousands)
Net cash (used in) provided by operating activities attributable to continuing operations	$	(53,803	)	$	87,776		$	(37,783	)	$	(3,810	)
Cash flows from investing activities attributable to continuing operations:
Acquisitions, net of cash acquired	—			(3,002		)	(2,707		)	(5,709		)
Capital expenditures	(935		)	(8,530		)	(3,411		)	(12,876		)
Proceeds from maturities and sales of marketable debt securities	6,050			—			—			6,050
Purchases of marketable debt securities	(47,930		)	—			—			(47,930		)
Purchases of long-term investments	—			—			(8,345		)	(8,345		)
Other, net	3,615			(356		)	(416		)	2,843
Net cash used in investing activities attributable to continuing operations	(39,200		)	(11,888		)	(14,879		)	(65,967		)
Cash flows from financing activities attributable to continuing operations:
Purchase of treasury stock	(200,000		)	—			—			(200,000		)
Dividends	(28,675		)	—			—			(28,675		)
Issuance of common stock, net of withholding taxes	(10,339		)	—			—			(10,339		)
Excess tax benefits from stock-based awards	16,715			—			131			16,846
Purchase of noncontrolling interests	—			—			(15,338		)	(15,338		)
Acquisition-related contingent consideration payment	—			(180		)	—			(180		)
Intercompany	18,083			(76,739		)	58,656			—
Other, net	—			—			110			110
Net cash (used in) provided by financing activities attributable to continuing operations	(204,216		)	(76,919		)	43,559			(237,576		)
Total cash used in continuing operations	(297,219		)	(1,031		)	(9,103		)	(307,353		)
Effect of exchange rate changes on cash and cash equivalents	—			10			(11,465		)	(11,455		)
Net decrease in cash and cash equivalents	(297,219		)	(1,021		)	(20,568		)	(318,808		)
Cash and cash equivalents at beginning of period	766,076			1,021			223,308			990,405
Cash and cash equivalents at end of period	$	468,857		$	—		$	202,740		$	671,597
Statement of cash flows for the three months ended March 31, 2014:
	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			IAC Consolidated
	(In thousands)
Net cash (used in) provided by operating activities attributable to continuing operations	$	(29,300	)	$	72,253		$	(312	)	$	42,641
Cash flows from investing activities attributable to continuing operations:
Acquisitions, net of cash acquired	—			(54,483		)	(23,498		)	(77,981		)
Capital expenditures	(985		)	(5,931		)	(2,805		)	(9,721		)
Purchases of marketable debt securities	(32,848		)	—			—			(32,848		)
Purchases of long-term investments	(3,000		)	(3,286		)	(1,575		)	(7,861		)
Other, net	2			—			(159		)	(157		)
Net cash used in investing activities attributable to continuing operations	(36,831		)	(63,700		)	(28,037		)	(128,568		)
Cash flows from financing activities attributable to continuing operations:
Dividends	(20,004		)	—			—			(20,004		)
Issuance of common stock, net of withholding taxes	920			—			—			920
Excess tax benefits from stock-based awards	15,610			—			8,593			24,203
Purchase of noncontrolling interests	—			(30,000		)	—			(30,000		)
Funds returned from escrow for Meetic tender offer	—			—			12,354			12,354
Intercompany	(41,436		)	21,448			19,988			—
Other, net	(374		)	—			79			(295		)
Net cash (used in) provided by financing activities attributable to continuing operations	(45,284		)	(8,552		)	41,014			(12,822		)
Total cash (used in) provided by continuing operations	(111,415		)	1			12,665			(98,749		)
Effect of exchange rate changes on cash and cash equivalents	—			(1		)	1,617			1,616
Net (decrease) increase in cash and cash equivalents	(111,415		)	—			14,282			(97,133		)
Cash and cash equivalents at beginning of period	782,022			—			318,422			1,100,444
Cash and cash equivalents at end of period	$	670,607		$	—		$	332,704		$	1,003,311

THE_COMPANY_AND_SUMMARY_OF_SIG1

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounting Estimates	Accounting Estimates
	The preparation of consolidated financial statements in accordance with GAAP requires management to make certain estimates, judgments and assumptions that impact the reported amounts of assets, liabilities, revenue and expenses and the related disclosure of contingent assets and liabilities. Actual results could differ from these estimates.
	On an ongoing basis, the Company evaluates its estimates and judgments including those related to: the fair values of marketable securities and other investments; the recoverability of goodwill and indefinite-lived intangible assets; the useful lives and recovery of definite-lived intangible assets and property and equipment; the carrying value of accounts receivable, including the determination of the allowance for doubtful accounts and revenue reserves; the fair value of acquisition-related contingent consideration; the liabilities for uncertain tax positions; the valuation allowance for deferred income tax assets; and the fair value of and forfeiture rates for stock-based awards, among others. The Company bases its estimates and judgments on historical experience, its forecasts and budgets and other factors that the Company considers relevant.

MARKETABLE_SECURITIES_Tables

MARKETABLE SECURITIES (Tables)	3 Months Ended
	Mar. 31, 2015
Marketable Securities [Abstract]
Schedule of current available-for-sale marketable securities	At March 31, 2015, current available-for-sale marketable securities are as follows:
		Amortized		Gross		Gross			Fair
		Cost		Unrealized		Unrealized			Value
				Gains		Losses
		(In thousands)
	Corporate debt securities	$	204,450	$	310	$	(60	)	$	204,700
	Equity security	98		823		—			921
	Total marketable securities	$	204,548	$	1,133	$	(60	)	$	205,621
	All of the Company’s marketable debt securities are rated investment grade. The gross unrealized losses on the marketable debt securities relate principally to changes in interest rates. Because the Company does not intend to sell any marketable debt securities and it is not more likely than not that the Company will be required to sell any marketable debt securities before recovery of their amortized cost bases, which may be maturity, the Company does not consider any of its marketable debt securities to be other-than-temporarily impaired at March 31, 2015.
	At December 31, 2014, current available-for-sale marketable securities are as follows:
		Amortized		Gross		Gross			Fair
		Cost		Unrealized		Unrealized			Value
				Gains		Losses
		(In thousands)
	Corporate debt securities	$	159,418	$	34	$	(255	)	$	159,197
	Equity security	98		1,353		—			1,451
	Total marketable securities	$	159,516	$	1,387	$	(255	)	$	160,648
Schedule of contractual maturities of debt securities classified as available-for-sale	The contractual maturities of debt securities classified as current available-for-sale at March 31, 2015 are as follows:
		Amortized		Fair
		Cost		Value
		(In thousands)
	Due in one year or less	$	69,218	$	69,220
	Due after one year through five years	135,232		135,480
	Total	$	204,450	$	204,700
Schedule of proceeds from maturities and sales of current and non-current available-for-sale marketable securities and the related gross realized gains and losses	The following table presents the proceeds from maturities and sales of current and non-current available-for-sale marketable securities:
		Three Months Ended March 31,
		2015		2014
		(In thousands)
	Proceeds from maturities and sales of available-for-sale marketable securities	$	6,050	$	—

FAIR_VALUE_MEASUREMENTS_AND_FI1

FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Schedule of assets and liabilities measured at fair value on a recurring basis	The following tables present the Company's financial instruments that are measured at fair value on a recurring basis:
		March 31, 2015
		Quoted Market			Significant			Significant			Total
		Prices in Active			Other			Unobservable			Fair Value
		Markets for			Observable			Inputs			Measurements
		Identical Assets			Inputs			(Level 3)
		(Level 1)			(Level 2)
		(In thousands)
	Assets:
	Cash equivalents:
	Money market funds	$	107,661		$	—		$	—		$	107,661
	Commercial paper	—			204,236			—			204,236
	Time deposits	—			34,004			—			34,004
	Marketable securities:
	Corporate debt securities	—			204,700			—			204,700
	Equity security	921			—			—			921
	Long-term investments:
	Auction rate security	—			—			6,190			6,190
	Marketable equity security	7,924			—			—			7,924
	Total	$	116,506		$	442,940		$	6,190		$	565,636
	Liabilities:
	Contingent consideration arrangements	$	—		$	—		$	(20,964	)	$	(20,964	)
		December 31, 2014
		Quoted Market			Significant			Significant			Total
		Prices in Active			Other			Unobservable			Fair Value
		Markets for			Observable			Inputs			Measurements
		Identical Assets			Inputs			(Level 3)
		(Level 1)			(Level 2)
		(In thousands)
	Assets:
	Cash equivalents:
	Money market funds	$	174,720		$	—		$	—		$	174,720
	Commercial paper	—			388,801			—			388,801
	Time deposits	—			42,914			—			42,914
	Marketable securities:
	Corporate debt securities	—			159,197			—			159,197
	Equity security	1,451			—			—			1,451
	Long-term investments:
	Auction rate security	—			—			6,070			6,070
	Marketable equity security	7,410			—			—			7,410
	Total	$	183,581		$	590,912		$	6,070		$	780,563
	Liabilities:
	Contingent consideration arrangements	$	—		$	—		$	(30,140	)	$	(30,140	)
Schedule of changes in assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)	The following table presents the changes in the Company's financial instruments that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3):
		Three Months Ended March 31,
		2015						2014
		Auction Rate			Contingent			Auction Rate			Contingent
		Security			Consideration			Security			Consideration
					Arrangements						Arrangements
		(In thousands)
	Balance at January 1	$	6,070		$	(30,140	)	$	8,920		$	(45,828	)
	Total net gains (losses):
	Included in earnings	—			7,626			—			27
	Included in other comprehensive income (loss)	120			1,733			230			(363		)
	Fair value at date of acquisition	—			(363		)	—			(2,835		)
	Settlements	—			180			—			241
	Balance at March 31	$	6,190		$	(20,964	)	$	9,150		$	(48,758	)
Fair Value, by Balance Sheet Grouping	The following table presents the carrying value and the fair value of financial instruments measured at fair value only for disclosure purposes:
		31-Mar-15						31-Dec-14
		Carrying			Fair			Carrying			Fair
		Value			Value			Value			Value
		(In thousands)
	Long-term debt	$	(1,080,000	)	$	(1,100,002	)	$	(1,080,000	)	$	(1,099,813	)

LONGTERM_DEBT_Tables

LONG-TERM DEBT (Tables)	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	Long-term debt consists of:
		31-Mar-15		31-Dec-14
		(In thousands)
	4.875% Senior Notes due November 30, 2018 (the "2013 Senior Notes"); interest payable each May 30 and November 30, which commenced May 30, 2014	$	500,000	$	500,000
	4.75% Senior Notes due December 15, 2022 (the "2012 Senior Notes"); interest payable each June 15 and December 15, which commenced June 15, 2013	500,000		500,000
	5% New York City Industrial Development Agency Liberty Bonds due September 1, 2035; interest payable each March 1 and September 1, which commenced March 1, 2006	80,000		80,000
	Total long-term debt	$	1,080,000	$	1,080,000

ACCUMULATED_OTHER_COMPREHENSIV1

ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Schedule of accumulated other comprehensive loss	The following tables present the components of accumulated other comprehensive (loss) income. There have been no amounts reclassified out of accumulated other comprehensive loss into earnings for the three months ended March 31, 2015 and 2014.
		Three Months Ended March 31, 2015
		Foreign Currency Translation Adjustment			Unrealized (Losses) Gains On Available-For-Sale Securities			Accumulated Other Comprehensive Loss
		(In thousands)
	Balance as of December 31	$	(86,848	)	$	(852	)	$	(87,700	)
	Other comprehensive (loss) income, net of tax provision of $0.1 million related to unrealized gains on available-for-sale securities	(56,334		)	761			(55,573		)
	Balance as of March 31	$	(143,182	)	$	(91	)	$	(143,273	)
		Three Months Ended March 31, 2014
		Foreign Currency Translation Adjustment			Unrealized Gains On Available-For-Sale Securities			Accumulated Other Comprehensive (Loss) Income
		(In thousands)
	Balance as of December 31	$	(20,352	)	$	7,306		$	(13,046	)
	Other comprehensive income, net of tax provision of $0.6 million related to unrealized gains on available-for-sale securities	5,220			129			5,349
	Balance as of March 31	$	(15,132	)	$	7,435		$	(7,697	)

EARNINGS_PER_SHARE_Tables

EARNINGS PER SHARE (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Computation of basic and diluted earnings per share	The following table sets forth the computation of basic and diluted earnings per share attributable to IAC shareholders.
		Three Months Ended March 31,
		2015				2014
		Basic		Diluted		Basic			Diluted
		(In thousands, except per share data)
	Numerator:
	Earnings from continuing operations	$	21,863	$	21,863	$	34,305		$	34,305
	Net loss attributable to noncontrolling interests	4,417		4,417		2,394			2,394
	Earnings from continuing operations attributable to IAC shareholders	26,280		26,280		36,699			36,699
	Earnings (loss) from discontinued operations attributable to IAC shareholders	125		125		(814		)	(814		)
	Net earnings attributable to IAC shareholders	$	26,405	$	26,405	$	35,885		$	35,885
	Denominator:
	Weighted average basic shares outstanding	83,453		83,453		82,484			82,484
	Dilutive securities including stock options and RSUs(a)	—		5,305		—			4,720
	Denominator for earnings per share—weighted average shares(a)	83,453		88,758		82,484			87,204
	Earnings per share attributable to IAC shareholders:
	Earnings per share from continuing operations	$	0.31	$	0.3	$	0.44		$	0.42
	Discontinued operations	0.01		—		—			(0.01		)
	Earnings per share	$	0.32	$	0.3	$	0.44		$	0.41
	_________________________________________
	(a) If the effect is dilutive, weighted average common shares outstanding include the incremental shares that would be issued upon the assumed exercise of stock options and vesting of restricted stock units ("RSUs"). For the three months ended March 31, 2015 approximately 2.0 million shares related to potentially dilutive securities are excluded from the calculation of diluted earnings per share because their inclusion would have been anti-dilutive. For the three months ended March 31, 2014, there are no securities that are excluded from the calculation of diluted earnings per share.

SEGMENT_INFORMATION_Tables

SEGMENT INFORMATION (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Schedule of reconciliation of revenues from segments to consolidated
		Three Months Ended March 31,
		2015			2014
		(In thousands)
	Revenue:
	Search & Applications	$	382,898		$	398,035
	The Match Group	239,211			211,187
	Media	43,612			36,355
	eCommerce	107,010			94,842
	Inter-segment elimination	(219		)	(172		)
	Total	$	772,512		$	740,247
Schedule of reconciliation of operating income (loss) from segments to consolidated
		Three Months Ended March 31,
		2015			2014
		(In thousands)
	Operating Income (Loss):
	Search & Applications	$	64,300		$	70,337
	The Match Group	25,312			39,803
	Media	(15,352		)	(8,566		)
	eCommerce	(6,854		)	(1,561		)
	Corporate	(32,287		)	(28,301		)
	Total	$	35,119		$	71,712
Schedule of reconciliation of Adjusted EBITDA from segments to consolidated
		Three Months Ended March 31,
		2015			2014
		(In thousands)
	Adjusted EBITDA:
	Search & Applications	$	78,901		$	82,071
	The Match Group	25,856			47,430
	Media	(14,583		)	(7,864		)
	eCommerce	(3,137		)	2,804
	Corporate	(11,880		)	(16,346		)
	Total	$	75,157		$	108,095
Schedule of revenue and long-lived assets, excluding goodwill and intangible assets, by geography	Revenue by geography is based on where the customer is located. Geographic information about revenue and long-lived assets is presented below:
		Three Months Ended March 31,
		2015			2014
		(In thousands)
	Revenue:
	United States	$	570,013		$	504,403
	All other countries	202,499			235,844
	Total	$	772,512		$	740,247
		March 31,			December 31,
		2015			2014
		(In thousands)
	Long-lived assets (excluding goodwill and intangible assets):
	United States	$	279,606		$	281,879
	All other countries	18,350			20,580
	Total	$	297,956		$	302,459
Schedule of reconciliation of Adjusted EBITDA to operating income (loss) for the entity's reportable segments	The following tables reconcile Adjusted EBITDA to operating income (loss) for the Company's reportable segments:
		Three Months Ended March 31, 2015
		Adjusted			Stock-Based			Depreciation			Amortization			Acquisition-related Contingent Consideration Fair Value Adjustments			Operating
		EBITDA			Compensation						of Intangibles						Income
					Expense												(Loss)
		(In thousands)
	Search & Applications	$	78,901		$	—		$	(3,616	)	$	(6,965	)	$	(4,020	)	$	64,300
	The Match Group	25,856			(613		)	(7,065		)	(3,877		)	11,011			25,312
	Media	(14,583		)	(147		)	(204		)	(423		)	5			(15,352		)
	eCommerce	(3,137		)	(420		)	(2,007		)	(1,290		)	—			(6,854		)
	Corporate	(11,880		)	(17,731		)	(2,676		)	—			—			(32,287		)
	Total	$	75,157		$	(18,911	)	$	(15,568	)	$	(12,555	)	$	6,996		$	35,119
		Three Months Ended March 31, 2014
		Adjusted			Stock-Based			Depreciation			Amortization			Acquisition-related Contingent Consideration Fair Value Adjustments			Operating
		EBITDA			Compensation						of Intangibles						Income
					Expense												(Loss)
		(In thousands)
	Search & Applications	$	82,071		$	—		$	(4,465	)	$	(7,269	)	$	—		$	70,337
	The Match Group	47,430			(17		)	(5,800		)	(1,837		)	27			39,803
	Media	(7,864		)	(164		)	(282		)	(256		)	—			(8,566		)
	eCommerce	2,804			—			(1,748		)	(2,617		)	—			(1,561		)
	Corporate	(16,346		)	(9,432		)	(2,523		)	—			—			(28,301		)
	Total	$	108,095		$	(9,613	)	$	(14,818	)	$	(11,979	)	$	27		$	71,712

GUARANTOR_AND_NONGUARANTOR_FIN1

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Tables)	3 Months Ended
	Mar. 31, 2015
Guarantor and Nonguarantor Financial Statements [Abstract]
Schedule of condensed balance sheet	Balance sheet at March 31, 2015:
		IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Total Eliminations			IAC Consolidated
		(In thousands)
	Cash and cash equivalents	$	468,857		$	—		$	202,740		$	—		$	671,597
	Marketable securities	204,700			—			921			—			205,621
	Accounts receivable, net	17			156,409			76,038			—			232,464
	Other current assets	41,743			93,861			54,186			(5,529		)	184,261
	Intercompany receivables	—			1,732,085			982,713			(2,714,798		)	—
	Property and equipment, net	5,511			229,513			62,932			—			297,956
	Goodwill	—			1,250,200			470,701			—			1,720,901
	Intangible assets, net	—			319,502			150,050			—			469,552
	Investment in subsidiaries	5,056,128			916,116			—			(5,972,244		)	—
	Other non-current assets	44,460			21,042			112,382			(2,131		)	175,753
	Total assets	$	5,821,416		$	4,718,728		$	2,112,663		$	(8,694,702	)	$	3,958,105
	Accounts payable, trade	$	3,954		$	56,934		$	22,558		$	—		$	83,446
	Other current liabilities	44,152			318,375			180,402			(623		)	542,306
	Long-term debt	1,000,000			80,000			—			—			1,080,000
	Income taxes payable	909			4,777			23,614			—			29,300
	Intercompany liabilities	2,714,798			—			—			(2,714,798		)	—
	Other long-term liabilities	304,889			104,257			39,935			(7,037		)	442,044
	Redeemable noncontrolling interests	—			—			28,295			—			28,295
	IAC shareholders' equity	1,752,714			4,154,385			1,817,859			(5,972,244		)	1,752,714
	Total liabilities and shareholders' equity	$	5,821,416		$	4,718,728		$	2,112,663		$	(8,694,702	)	$	3,958,105
	Balance sheet at December 31, 2014:
		IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Total Eliminations			IAC Consolidated
		(In thousands)
	Cash and cash equivalents	$	766,076		$	1,021		$	223,308		$	—		$	990,405
	Marketable securities	159,197			—			1,451			—			160,648
	Accounts receivable, net	13			155,262			80,811			—			236,086
	Other current assets	23,923			91,105			57,487			(5,773		)	166,742
	Intercompany receivables	—			1,688,403			970,810			(2,659,213		)	—
	Property and equipment, net	4,950			232,819			64,690			—			302,459
	Goodwill	—			1,249,807			505,119			—			1,754,926
	Intangible assets, net	—			325,771			166,165			—			491,936
	Investment in subsidiaries	5,035,304			930,443			—			(5,965,747		)	—
	Other non-current assets	44,610			20,682			109,372			(2,988		)	171,676
	Total assets	$	6,034,073		$	4,695,313		$	2,179,213		$	(8,633,721	)	$	4,274,878
	Accounts payable, trade	$	3,059		$	55,320		$	22,784		$	—		$	81,163
	Other current liabilities	73,491			328,920			191,197			(817		)	592,791
	Long-term debt	1,000,000			80,000			—			—			1,080,000
	Income taxes payable	2,240			4,771			25,624			—			32,635
	Intercompany liabilities	2,659,213			—			—			(2,659,213		)	—
	Other long-term liabilities	304,117			104,219			54,328			(7,944		)	454,720
	Redeemable noncontrolling interests	—			—			40,427			—			40,427
	IAC shareholders' equity	1,991,953			4,122,083			1,843,664			(5,965,747		)	1,991,953
	Noncontrolling interests	—			—			1,189			—			1,189
	Total liabilities and shareholders' equity	$	6,034,073		$	4,695,313		$	2,179,213		$	(8,633,721	)	$	4,274,878
Schedule of condensed income statement	Statement of operations for the three months ended March 31, 2015:
		IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Total Eliminations			IAC Consolidated
		(In thousands)
	Revenue	$	—		$	594,801		$	180,360		$	(2,649	)	$	772,512
	Operating costs and expenses:
	Cost of revenue (exclusive of depreciation shown separately below)	245			119,741			71,764			(197		)	191,553
	Selling and marketing expense	1,055			288,625			70,396			(2,410		)	357,666
	General and administrative expense	24,064			65,753			25,019			(42		)	114,794
	Product development expense	2,177			31,134			11,946			—			45,257
	Depreciation	401			11,580			3,587			—			15,568
	Amortization of intangibles	—			6,270			6,285			—			12,555
	Total operating costs and expenses	27,942			523,103			188,997			(2,649		)	737,393
	Operating (loss) income	(27,942		)	71,698			(8,637		)	—			35,119
	Equity in earnings of unconsolidated affiliates	54,124			3,696			—			(57,820		)	—
	Interest expense	(12,990		)	(1,046		)	(28		)	—			(14,064		)
	Other (expense) income, net	(9,353		)	11,392			4,949			—			6,988
	Earnings (loss) from continuing operations before income taxes	3,839			85,740			(3,716		)	(57,820		)	28,043
	Income tax benefit (provision)	22,441			(31,796		)	3,175			—			(6,180		)
	Earnings (loss) from continuing operations	26,280			53,944			(541		)	(57,820		)	21,863
	Earnings from discontinued operations, net of tax	125			—			—			—			125
	Net earnings (loss)	26,405			53,944			(541		)	(57,820		)	21,988
	Net loss attributable to noncontrolling interests	—			—			4,417			—			4,417
	Net earnings attributable to IAC shareholders	$	26,405		$	53,944		$	3,876		$	(57,820	)	$	26,405
	Comprehensive (loss) income attributable to IAC shareholders	$	(29,168	)	$	48,159		$	(52,868	)	$	4,709		$	(29,168	)
	Statement of operations for the three months ended March 31, 2014:
		IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Total Eliminations			IAC Consolidated
		(In thousands)
	Revenue	$	—		$	546,326		$	196,907		$	(2,986	)	$	740,247
	Operating costs and expenses:
	Cost of revenue (exclusive of depreciation shown separately below)	(28		)	129,301			80,921			(960		)	209,234
	Selling and marketing expense	192			236,341			63,764			(1,698		)	298,599
	General and administrative expense	22,446			45,675			26,955			13			95,089
	Product development expense	1,471			27,096			10,590			(341		)	38,816
	Depreciation	329			9,561			4,928			—			14,818
	Amortization of intangibles	—			9,001			2,978			—			11,979
	Total operating costs and expenses	24,410			456,975			190,136			(2,986		)	668,535
	Operating (loss) income	(24,410		)	89,351			6,771			—			71,712
	Equity in earnings of unconsolidated affiliates	54,297			932			—			(55,229		)	—
	Interest expense	(12,985		)	(1,042		)	(37		)	—			(14,064		)
	Other income (expense), net	9,685			(10,527		)	(1,116		)	—			(1,958		)
	Earnings from continuing operations before income taxes	26,587			78,714			5,618			(55,229		)	55,690
	Income tax benefit (provision)	10,112			(29,944		)	(1,553		)	—			(21,385		)
	Earnings from continuing operations	36,699			48,770			4,065			(55,229		)	34,305
	Loss from discontinued operations, net of tax	(814		)	—			(13		)	13			(814		)
	Net earnings	35,885			48,770			4,052			(55,216		)	33,491
	Net loss attributable to noncontrolling interests	—			—			2,394			—			2,394
	Net earnings attributable to IAC shareholders	$	35,885		$	48,770		$	6,446		$	(55,216	)	$	35,885
	Comprehensive income attributable to IAC shareholders	$	41,234		$	49,153		$	10,115		$	(59,268	)	$	41,234
Schedule of condensed cash flow statement	Statement of cash flows for the three months ended March 31, 2015:
		IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			IAC Consolidated
		(In thousands)
	Net cash (used in) provided by operating activities attributable to continuing operations	$	(53,803	)	$	87,776		$	(37,783	)	$	(3,810	)
	Cash flows from investing activities attributable to continuing operations:
	Acquisitions, net of cash acquired	—			(3,002		)	(2,707		)	(5,709		)
	Capital expenditures	(935		)	(8,530		)	(3,411		)	(12,876		)
	Proceeds from maturities and sales of marketable debt securities	6,050			—			—			6,050
	Purchases of marketable debt securities	(47,930		)	—			—			(47,930		)
	Purchases of long-term investments	—			—			(8,345		)	(8,345		)
	Other, net	3,615			(356		)	(416		)	2,843
	Net cash used in investing activities attributable to continuing operations	(39,200		)	(11,888		)	(14,879		)	(65,967		)
	Cash flows from financing activities attributable to continuing operations:
	Purchase of treasury stock	(200,000		)	—			—			(200,000		)
	Dividends	(28,675		)	—			—			(28,675		)
	Issuance of common stock, net of withholding taxes	(10,339		)	—			—			(10,339		)
	Excess tax benefits from stock-based awards	16,715			—			131			16,846
	Purchase of noncontrolling interests	—			—			(15,338		)	(15,338		)
	Acquisition-related contingent consideration payment	—			(180		)	—			(180		)
	Intercompany	18,083			(76,739		)	58,656			—
	Other, net	—			—			110			110
	Net cash (used in) provided by financing activities attributable to continuing operations	(204,216		)	(76,919		)	43,559			(237,576		)
	Total cash used in continuing operations	(297,219		)	(1,031		)	(9,103		)	(307,353		)
	Effect of exchange rate changes on cash and cash equivalents	—			10			(11,465		)	(11,455		)
	Net decrease in cash and cash equivalents	(297,219		)	(1,021		)	(20,568		)	(318,808		)
	Cash and cash equivalents at beginning of period	766,076			1,021			223,308			990,405
	Cash and cash equivalents at end of period	$	468,857		$	—		$	202,740		$	671,597
	Statement of cash flows for the three months ended March 31, 2014:
		IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			IAC Consolidated
		(In thousands)
	Net cash (used in) provided by operating activities attributable to continuing operations	$	(29,300	)	$	72,253		$	(312	)	$	42,641
	Cash flows from investing activities attributable to continuing operations:
	Acquisitions, net of cash acquired	—			(54,483		)	(23,498		)	(77,981		)
	Capital expenditures	(985		)	(5,931		)	(2,805		)	(9,721		)
	Purchases of marketable debt securities	(32,848		)	—			—			(32,848		)
	Purchases of long-term investments	(3,000		)	(3,286		)	(1,575		)	(7,861		)
	Other, net	2			—			(159		)	(157		)
	Net cash used in investing activities attributable to continuing operations	(36,831		)	(63,700		)	(28,037		)	(128,568		)
	Cash flows from financing activities attributable to continuing operations:
	Dividends	(20,004		)	—			—			(20,004		)
	Issuance of common stock, net of withholding taxes	920			—			—			920
	Excess tax benefits from stock-based awards	15,610			—			8,593			24,203
	Purchase of noncontrolling interests	—			(30,000		)	—			(30,000		)
	Funds returned from escrow for Meetic tender offer	—			—			12,354			12,354
	Intercompany	(41,436		)	21,448			19,988			—
	Other, net	(374		)	—			79			(295		)
	Net cash (used in) provided by financing activities attributable to continuing operations	(45,284		)	(8,552		)	41,014			(12,822		)
	Total cash (used in) provided by continuing operations	(111,415		)	1			12,665			(98,749		)
	Effect of exchange rate changes on cash and cash equivalents	—			(1		)	1,617			1,616
	Net (decrease) increase in cash and cash equivalents	(111,415		)	—			14,282			(97,133		)
	Cash and cash equivalents at beginning of period	782,022			—			318,422			1,100,444
	Cash and cash equivalents at end of period	$	670,607		$	—		$	332,704		$	1,003,311

THE_COMPANY_AND_SUMMARY_OF_SIG2

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Revenue from major customers
Number of countries where brands and products reach users	200
Revenue	$772,512	$740,247
Accounts receivable, net of allowance of $13,128 and $12,437, respectively	232,464		236,086
Google Inc.
Revenue from major customers
Revenue	339,600	355,600
Accounts receivable, net of allowance of $13,128 and $12,437, respectively	$111,700		$118,700

INCOME_TAXES_Details

INCOME TAXES (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Income taxes (payable) receivable and deferred tax (liabilities) assets include in the Balance Sheet captions [Line Items]
Income tax provision	($6,180,000)	($21,385,000)
Effective tax rate (as a percent)	22.00%	38.00%
Federal statutory rate (as a percent)	35.00%	35.00%
Accrued interest on unrecognized tax benefits	2,500,000		2,800,000
Accrued penalties on unrecognized tax benefits	2,300,000		2,900,000
Total unrecognized tax benefits including interest	30,400,000		33,200,000
Unrecognized tax benefit, if recognized would reduce income tax expense for continuing operations	28,100,000
Change In Unrecognized Tax Benefits Unrelated To The Federal Income Taxes Statute Of Limitations Expiring Reasonably Possible Within Twelve Months Of The Current Reporting Period	7,800,000
Change In Unrecognized Tax Benefits Unrelated To The Federal Income Taxes Statute Of Limitations Expiring Reasonably Possible Within Twelve Months Of The Current Reporting Period, Income Tax Provision	7,400,000
Continuing Operations [Member]
Income taxes (payable) receivable and deferred tax (liabilities) assets include in the Balance Sheet captions [Line Items]
Unrecognized Tax Benefits, Interest on Income Taxes Expense	$100,000	($1,600,000)

MARKETABLE_SECURITIES_Details

MARKETABLE SECURITIES (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current available-for-sale marketable securities
Amortized Cost	$204,548	$159,516
Gross Unrealized Gains	1,133	1,387
Gross unrealized losses	-60	-255
Marketable securities	205,621	160,648
Contractual maturities of debt securities classified as available-for-sale
Due in one year or less, amortized cost	69,218
Due after one year through five years, amortized cost	135,232
Total Amortized Cost	204,450
Due in one year or less, fair value	69,220
Due after one year through five years, fair value	135,480
Total, Estimated Fair Value	204,700
Corporate debt securities
Current available-for-sale marketable securities
Amortized Cost	204,450	159,418
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before tax	310	34
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	60	255
Marketable securities	204,700	159,197
Equity security
Current available-for-sale marketable securities
Amortized Cost	98	98
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	823	1,353
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Marketable securities	$921	$1,451

MARKETABLE_SECURITIES_Details_

MARKETABLE SECURITIES (Details 1) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	$205,621		$160,648
Proceeds from maturities and sales of current and non-current available-for-sale marketable securities and related gross realized gains and losses
Proceeds from maturities and sales of available-for-sale marketable securities	6,050	0
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	$204,700		$159,197

FAIR_VALUE_MEASUREMENTS_AND_FI2

FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Assets:
Marketable securities	$205,621	$160,648
Fair value on a recurring basis
Assets:
Total Assets	565,636	780,563
Liabilities:
Contingent consideration arrangement	-20,964	-30,140
Fair value on a recurring basis | Money market funds
Assets:
Cash equivalents:	107,661	174,720
Fair value on a recurring basis | Commercial paper
Assets:
Cash equivalents:	204,236	388,801
Fair value on a recurring basis | Time deposits
Assets:
Cash equivalents:	34,004	42,914
Fair value on a recurring basis | Corporate debt securities
Assets:
Marketable securities	204,700	159,197
Fair value on a recurring basis | Equity security
Assets:
Marketable securities	921	1,451
Long-term investments:	7,924	7,410
Fair value on a recurring basis | Auction rate security
Assets:
Long-term investments:	6,190	6,070
Fair value on a recurring basis | Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total Assets	116,506	183,581
Fair value on a recurring basis | Quoted Market Prices in Active Markets for Identical Assets (Level 1) | Money market funds
Assets:
Cash equivalents:	107,661	174,720
Fair value on a recurring basis | Quoted Market Prices in Active Markets for Identical Assets (Level 1) | Equity security
Assets:
Marketable securities	921	1,451
Long-term investments:	7,924	7,410
Fair value on a recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Total Assets	442,940	590,912
Fair value on a recurring basis | Significant Other Observable Inputs (Level 2) | Commercial paper
Assets:
Cash equivalents:	204,236	388,801
Fair value on a recurring basis | Significant Other Observable Inputs (Level 2) | Time deposits
Assets:
Cash equivalents:	34,004	42,914
Fair value on a recurring basis | Significant Other Observable Inputs (Level 2) | Corporate debt securities
Assets:
Marketable securities	204,700	159,197
Fair value on a recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Total Assets	6,190	6,070
Liabilities:
Contingent consideration arrangement	-20,964	-30,140
Fair value on a recurring basis | Significant Unobservable Inputs (Level 3) | Auction rate security
Assets:
Long-term investments:	$6,190	$6,070

FAIR_VALUE_MEASUREMENTS_AND_FI3

FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details 1) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Auction rate securities
Cost basis	$204,450,000
Gross unrealized losses	60,000		255,000
Contingent Consideration Arrangements
Number of Contingent Consideration Arrangements Related to Business Acquisitions	9
Number of Contingent Consideration Arrangements with Payment Limit	8
Number of Contingent Consideration Arrangements Without Payment Limit	1
Business Acquisition Contingent Consideration Maximum Amount At Balance Sheet date	189,000,000
Business Acquisition Contingent Consideration Fair Value at Balance Sheet Date With A Maximum Limit	20,500,000
Business Acquisition Contingent Consideration Fair value at Balance Sheet Date Without a Limit	500,000
Business Acquisition, Contingent Consideration, at Fair Value, Current	11,700,000
Business Acquisition, Contingent Consideration, at Fair Value, Noncurrent	9,200,000
Assets measured at fair value on a nonrecurring basis
Cost Method Investments	99,300,000		90,900,000
Auction rate security
Changes in assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance at the beginning of the period, assets	6,070,000	8,920,000
Total net gains (losses) included in other comprehensive income (loss), Asset	120,000	230,000
Balance at the end of the period, assets	6,190,000	9,150,000
Auction rate securities
Cost basis	10,000,000		10,000,000
Gross unrealized losses	3,800,000		3,900,000
Contingent Consideration Arrangement
Changes in liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance at the beginning of the period	-30,140,000	-45,828,000
Total net gains (losses) included in earnings (unrealized), Liability	7,626,000	27,000
Total net gains (losses) included in other comprehensive income (loss), Liability	1,733,000	-363,000
Fair value at date of acquisition	363,000	2,835,000
Settlements	180,000	241,000
Balance at the end of the period	-20,964,000	-48,758,000
Equity security
Long-term marketable equity security
Cost Basis	8,700,000
Gross Unrealized Losses	$700,000		$1,200,000
Minimum [Member] | Contingent Consideration Arrangement
Contingent Consideration Arrangements
Contingent Consideration Discount Rates	15.00%
Maximum [Member] | Contingent Consideration Arrangement
Contingent Consideration Arrangements
Contingent Consideration Discount Rates	25.00%

FAIR_VALUE_MEASUREMENTS_AND_FI4

FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details 2) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Long-term Debt, Fair Value	($1,100,002)	($1,099,813)
Long-term debt	-1,080,000	-1,080,000
Reported Value Measurement [Member]
Assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Long-term debt	($1,080,000)	($1,080,000)

LONGTERM_DEBT_Details

LONG-TERM DEBT (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Nov. 15, 2013	Dec. 21, 2012
Debt Instrument [Line Items]
Total long-term debt	$1,080,000,000	$1,080,000,000
Senior Notes | 4.875% Senior Notes due November 30, 2018
Debt Instrument [Line Items]
Total long-term debt	500,000,000	500,000,000
Stated rate	4.88%	4.88%
Line of Credit Facility [Abstract]
Maximum leverage ratio			3
Senior Notes | 4.75% Senior Notes Due December 2022
Debt Instrument [Line Items]
Total long-term debt	500,000,000	500,000,000
Stated rate	4.75%	4.75%
Line of Credit Facility [Abstract]
Maximum leverage ratio				3
Bonds | 5% New York City Industrial Development Agency Bonds due September 2035
Debt Instrument [Line Items]
Total long-term debt	80,000,000	80,000,000
Stated rate	5.00%	5.00%
Revolving Credit Facility
Line of Credit Facility [Abstract]
Line of credit, maximum borrowing capacity				300,000,000
Line of credit, amount outstanding	$0	$0
Line of credit, commitment fee percentage	0.30%	0.25%
Maximum leverage ratio				3

ACCUMULATED_OTHER_COMPREHENSIV2

ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	($87,700)
Ending Balance	-143,273
Tax effect of other comprehensive loss before reclassifications related to unrealized losses on available-for-sale securities	100	600
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	-86,848	-20,352
Other comprehensive income before reclassifications, net of tax provision related to unrealized gains on available-for-sale securities	-56,334	5,220
Ending Balance	-143,182	-15,132
Unrealized (Losses) Gains On Available-For-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	-852	7,306
Other comprehensive income before reclassifications, net of tax provision related to unrealized gains on available-for-sale securities	761	129
Ending Balance	-91	7,435
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	-87,700	-13,046
Other comprehensive income before reclassifications, net of tax provision related to unrealized gains on available-for-sale securities	-55,573	5,349
Ending Balance	($143,273)	($7,697)

EARNINGS_PER_SHARE_Details

EARNINGS PER SHARE (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Numerator: Basic
Earnings from continuing operations	$21,863	$34,305
Net loss attributable to noncontrolling interests	4,417	2,394
Earnings from continuing operations attributable to IAC shareholders	26,280	36,699
Earnings from discontinued operations attributable to IAC shareholders	125	-814
Net earnings attributable to IAC shareholders	26,405	35,885
Numerator: Diluted
Earnings from continuing operations	21,863	34,305
Net loss attributable to noncontrolling interests	4,417	2,394
Earnings from continuing operations attributable to IAC shareholders	26,280	36,699
Earnings from discontinued operations attributable to IAC shareholders	125	-814
Net earnings attributable to IAC shareholders	$26,405	$35,885
Denominator: Basic
Weighted average basic shares outstanding	83,453	82,484
Denominator: Diluted
Weighted average basic shares outstanding	83,453	82,484
Dilutive securities including stock options and RSUs (in shares)	5,305	4,720
Denominator for earnings per share-weighted average shares (in shares)	88,758	87,204
Earnings (loss) per share attributable to IAC shareholders: Basic
Earnings per share from continuing operations (in dollars per share)	$0.31	$0.44
Discontinued operations (in dollars per share)	$0.01	$0
Earnings per share (in dollars per share)	$0.32	$0.44
Earnings (loss) per share attributable to IAC shareholders: Diluted
Earnings per share from continuing operations (in dollars per share)	$0.30	$0.42
Discontinued operations (in dollars per share)	$0	($0.01)
Earnings per share (in dollars per share)	$0.30	$0.41

EARNINGS_PER_SHARE_Details_2

EARNINGS PER SHARE (Details 2) (RSUs)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
RSUs
Anti-dilutive weighted average common shares
Potentially dilutive securities excluded from calculation of diluted earnings per share (in shares)	2

SEGMENT_INFORMATION_Details

SEGMENT INFORMATION (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Segment reporting information
Revenue	$772,512	$740,247
Operating income	35,119	71,712
Reconciliation of Adjusted EBITDA to operating income (loss) for the entity's reportable segments
Adjusted EBITDA	75,157	108,095
Stock-Based Compensation Expense	-18,911	-9,613
Depreciation	-15,568	-14,818
Amortization of Intangibles	-12,555	-11,979
Acquisition-related contingent consideration fair value adjustments	6,996	27
Operating income	35,119	71,712
Search & Applications
Segment reporting information
Revenue	382,898	398,035
Operating income	64,300	70,337
Reconciliation of Adjusted EBITDA to operating income (loss) for the entity's reportable segments
Adjusted EBITDA	78,901	82,071
Stock-Based Compensation Expense	0	0
Depreciation	-3,616	-4,465
Amortization of Intangibles	-6,965	-7,269
Acquisition-related contingent consideration fair value adjustments	-4,020	0
Operating income	64,300	70,337
The Match Group
Segment reporting information
Revenue	239,211	211,187
Operating income	25,312	39,803
Reconciliation of Adjusted EBITDA to operating income (loss) for the entity's reportable segments
Adjusted EBITDA	25,856	47,430
Stock-Based Compensation Expense	-613	-17
Depreciation	-7,065	-5,800
Amortization of Intangibles	-3,877	-1,837
Acquisition-related contingent consideration fair value adjustments	11,011	27
Operating income	25,312	39,803
Media
Segment reporting information
Revenue	43,612	36,355
Operating income	-15,352	-8,566
Reconciliation of Adjusted EBITDA to operating income (loss) for the entity's reportable segments
Adjusted EBITDA	-14,583	-7,864
Stock-Based Compensation Expense	-147	-164
Depreciation	-204	-282
Amortization of Intangibles	-423	-256
Acquisition-related contingent consideration fair value adjustments	5	0
Operating income	-15,352	-8,566
eCommerce
Segment reporting information
Revenue	107,010	94,842
Operating income	-6,854	-1,561
Reconciliation of Adjusted EBITDA to operating income (loss) for the entity's reportable segments
Adjusted EBITDA	-3,137	2,804
Stock-Based Compensation Expense	-420	0
Depreciation	-2,007	-1,748
Amortization of Intangibles	-1,290	-2,617
Acquisition-related contingent consideration fair value adjustments	0	0
Operating income	-6,854	-1,561
Corporate
Segment reporting information
Operating income	-32,287	-28,301
Reconciliation of Adjusted EBITDA to operating income (loss) for the entity's reportable segments
Adjusted EBITDA	-11,880	-16,346
Stock-Based Compensation Expense	-17,731	-9,432
Depreciation	-2,676	-2,523
Amortization of Intangibles	0	0
Acquisition-related contingent consideration fair value adjustments	0
Operating income	-32,287	-28,301
Total Eliminations
Segment reporting information
Revenue	($219)	($172)

SEGMENT_INFORMATION_Details_2

SEGMENT INFORMATION (Details 2) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Revenue and long-lived assets by geography
Revenue	$772,512	$740,247
Long-lived assets (excluding goodwill and intangible assets)	297,956		302,459
United States
Revenue and long-lived assets by geography
Revenue	570,013	504,403
Long-lived assets (excluding goodwill and intangible assets)	279,606		281,879
All Other Countries [Member]
Revenue and long-lived assets by geography
Revenue	202,499	235,844
Long-lived assets (excluding goodwill and intangible assets)	$18,350		$20,580

CONTINGENCIES_Details

CONTINGENCIES (Details)	3 Months Ended
	Mar. 31, 2015
	lawsuit
Loss Contingency [Abstract]
Minimum number of lawsuits that could have material impact on the liquidity, results of operations, or financial condition	1

GUARANTOR_AND_NONGUARANTOR_FIN2

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS
Cash and cash equivalents	$671,597	$990,405	$1,003,311	$1,100,444
Marketable securities	205,621	160,648
Accounts receivable, net	232,464	236,086
Other current assets	184,261	166,742
Property and equipment, net of accumulated depreciation and amortization of $291,091 and $279,534, respectively	297,956	302,459
Goodwill	1,720,901	1,754,926
Intangible assets, net of accumulated amortization of $102,995 and $98,937, respectively	469,552	491,936
Other non-current assets	52,074	56,693
TOTAL ASSETS	3,958,105	4,274,878
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable, trade	83,446	81,163
Long-term debt	1,080,000	1,080,000
Income taxes payable	29,300	32,635
Other long-term liabilities	34,260	45,191
Redeemable noncontrolling interests	28,295	40,427
IAC shareholders' equity	1,752,714	1,991,953
Noncontrolling interests	0	1,189
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	3,958,105	4,274,878
IAC
ASSETS
Cash and cash equivalents	468,857	766,076	670,607	782,022
Marketable securities	204,700	159,197
Accounts receivable, net	17	13
Other current assets	41,743	23,923
Intercompany receivables	0	0
Property and equipment, net of accumulated depreciation and amortization of $291,091 and $279,534, respectively	5,511	4,950
Goodwill	0	0
Intangible assets, net of accumulated amortization of $102,995 and $98,937, respectively	0	0
Investment in subsidiaries	5,056,128	5,035,304
Other non-current assets	44,460	44,610
TOTAL ASSETS	5,821,416	6,034,073
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable, trade	3,954	3,059
Other current liabilities	44,152	73,491
Long-term debt	1,000,000	1,000,000
Income taxes payable	909	2,240
Intercompany liabilities	2,714,798	2,659,213
Other long-term liabilities	304,889	304,117
Redeemable noncontrolling interests	0	0
IAC shareholders' equity	1,752,714	1,991,953
Noncontrolling interests		0
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	5,821,416	6,034,073
Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	0	1,021	0	0
Marketable securities	0	0
Accounts receivable, net	156,409	155,262
Other current assets	93,861	91,105
Intercompany receivables	1,732,085	1,688,403
Property and equipment, net of accumulated depreciation and amortization of $291,091 and $279,534, respectively	229,513	232,819
Goodwill	1,250,200	1,249,807
Intangible assets, net of accumulated amortization of $102,995 and $98,937, respectively	319,502	325,771
Investment in subsidiaries	916,116	930,443
Other non-current assets	21,042	20,682
TOTAL ASSETS	4,718,728	4,695,313
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable, trade	56,934	55,320
Other current liabilities	318,375	328,920
Long-term debt	80,000	80,000
Income taxes payable	4,777	4,771
Intercompany liabilities	0	0
Other long-term liabilities	104,257	104,219
Redeemable noncontrolling interests	0	0
IAC shareholders' equity	4,154,385	4,122,083
Noncontrolling interests		0
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	4,718,728	4,695,313
Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	202,740	223,308	332,704	318,422
Marketable securities	921	1,451
Accounts receivable, net	76,038	80,811
Other current assets	54,186	57,487
Intercompany receivables	982,713	970,810
Property and equipment, net of accumulated depreciation and amortization of $291,091 and $279,534, respectively	62,932	64,690
Goodwill	470,701	505,119
Intangible assets, net of accumulated amortization of $102,995 and $98,937, respectively	150,050	166,165
Investment in subsidiaries	0	0
Other non-current assets	112,382	109,372
TOTAL ASSETS	2,112,663	2,179,213
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable, trade	22,558	22,784
Other current liabilities	180,402	191,197
Long-term debt	0	0
Income taxes payable	23,614	25,624
Intercompany liabilities	0	0
Other long-term liabilities	39,935	54,328
Redeemable noncontrolling interests	28,295	40,427
IAC shareholders' equity	1,817,859	1,843,664
Noncontrolling interests		1,189
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	2,112,663	2,179,213
Total Eliminations
ASSETS
Cash and cash equivalents	0	0
Marketable securities	0	0
Accounts receivable, net	0	0
Other current assets	-5,529	-5,773
Intercompany receivables	-2,714,798	-2,659,213
Property and equipment, net of accumulated depreciation and amortization of $291,091 and $279,534, respectively	0	0
Goodwill	0	0
Intangible assets, net of accumulated amortization of $102,995 and $98,937, respectively	0	0
Investment in subsidiaries	-5,972,244	-5,965,747
Other non-current assets	-2,131	-2,988
TOTAL ASSETS	-8,694,702	-8,633,721
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable, trade	0	0
Other current liabilities	-623	-817
Long-term debt	0	0
Income taxes payable	0	0
Intercompany liabilities	-2,714,798	-2,659,213
Other long-term liabilities	-7,037	-7,944
Redeemable noncontrolling interests	0	0
IAC shareholders' equity	-5,972,244	-5,965,747
Noncontrolling interests		0
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	-8,694,702	-8,633,721
IAC Consolidated
ASSETS
Cash and cash equivalents	671,597	990,405	1,003,311	1,100,444
Marketable securities	205,621	160,648
Accounts receivable, net	232,464	236,086
Other current assets	184,261	166,742
Intercompany receivables	0	0
Property and equipment, net of accumulated depreciation and amortization of $291,091 and $279,534, respectively	297,956	302,459
Goodwill	1,720,901	1,754,926
Intangible assets, net of accumulated amortization of $102,995 and $98,937, respectively	469,552	491,936
Investment in subsidiaries	0	0
Other non-current assets	175,753	171,676
TOTAL ASSETS	3,958,105	4,274,878
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable, trade	83,446	81,163
Other current liabilities	542,306	592,791
Long-term debt	1,080,000	1,080,000
Income taxes payable	29,300	32,635
Intercompany liabilities	0	0
Other long-term liabilities	442,044	454,720
Redeemable noncontrolling interests	28,295	40,427
IAC shareholders' equity	1,752,714	1,991,953
Noncontrolling interests		1,189
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$3,958,105	$4,274,878

GUARANTOR_AND_NONGUARANTOR_FIN3

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details2) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Revenue	$772,512	$740,247
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	191,553	209,234
Selling and marketing expense	357,666	298,599
General and administrative expense	114,794	95,089
Product development expense	45,257	38,816
Depreciation	15,568	14,818
Amortization of intangibles	12,555	11,979
Total operating costs and expenses	737,393	668,535
Operating income	35,119	71,712
Equity in earnings of unconsolidated affiliates	283	1,935
Interest expense	-14,064	-14,064
Other income (expense), net	6,988	-1,958
Earnings from continuing operations before income taxes	28,043	55,690
Income tax benefit (provision)	-6,180	-21,385
Earnings from continuing operations	21,863	34,305
Earnings (loss) from discontinued operations, net of tax	125	-814
Net earnings	21,988	33,491
Net loss attributable to noncontrolling interests	4,417	2,394
Net earnings attributable to IAC shareholders	26,405	35,885
Comprehensive income attributable to IAC shareholders	-29,168	41,234
IAC
Condensed Financial Statements, Captions [Line Items]
Revenue	0	0
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	245	-28
Selling and marketing expense	1,055	192
General and administrative expense	24,064	22,446
Product development expense	2,177	1,471
Depreciation	401	329
Amortization of intangibles	0	0
Total operating costs and expenses	27,942	24,410
Operating income	-27,942	-24,410
Equity in earnings of unconsolidated affiliates	54,124	54,297
Interest expense	-12,990	-12,985
Other income (expense), net	-9,353	9,685
Earnings from continuing operations before income taxes	3,839	26,587
Income tax benefit (provision)	22,441	10,112
Earnings from continuing operations	26,280	36,699
Earnings (loss) from discontinued operations, net of tax	125	-814
Net earnings	26,405	35,885
Net loss attributable to noncontrolling interests	0	0
Net earnings attributable to IAC shareholders	26,405	35,885
Comprehensive income attributable to IAC shareholders	-29,168	41,234
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue	594,801	546,326
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	119,741	129,301
Selling and marketing expense	288,625	236,341
General and administrative expense	65,753	45,675
Product development expense	31,134	27,096
Depreciation	11,580	9,561
Amortization of intangibles	6,270	9,001
Total operating costs and expenses	523,103	456,975
Operating income	71,698	89,351
Equity in earnings of unconsolidated affiliates	3,696	932
Interest expense	-1,046	-1,042
Other income (expense), net	11,392	-10,527
Earnings from continuing operations before income taxes	85,740	78,714
Income tax benefit (provision)	-31,796	-29,944
Earnings from continuing operations	53,944	48,770
Earnings (loss) from discontinued operations, net of tax	0	0
Net earnings	53,944	48,770
Net loss attributable to noncontrolling interests	0	0
Net earnings attributable to IAC shareholders	53,944	48,770
Comprehensive income attributable to IAC shareholders	48,159	49,153
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue	180,360	196,907
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	71,764	80,921
Selling and marketing expense	70,396	63,764
General and administrative expense	25,019	26,955
Product development expense	11,946	10,590
Depreciation	3,587	4,928
Amortization of intangibles	6,285	2,978
Total operating costs and expenses	188,997	190,136
Operating income	-8,637	6,771
Equity in earnings of unconsolidated affiliates	0	0
Interest expense	-28	-37
Other income (expense), net	4,949	-1,116
Earnings from continuing operations before income taxes	-3,716	5,618
Income tax benefit (provision)	3,175	-1,553
Earnings from continuing operations	-541	4,065
Earnings (loss) from discontinued operations, net of tax	0	-13
Net earnings	-541	4,052
Net loss attributable to noncontrolling interests	4,417	2,394
Net earnings attributable to IAC shareholders	3,876	6,446
Comprehensive income attributable to IAC shareholders	-52,868	10,115
Total Eliminations
Condensed Financial Statements, Captions [Line Items]
Revenue	-2,649	-2,986
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	-197	-960
Selling and marketing expense	-2,410	-1,698
General and administrative expense	-42	13
Product development expense	0	-341
Depreciation	0	0
Amortization of intangibles	0	0
Total operating costs and expenses	-2,649	-2,986
Operating income	0	0
Equity in earnings of unconsolidated affiliates	-57,820	-55,229
Interest expense	0	0
Other income (expense), net	0	0
Earnings from continuing operations before income taxes	-57,820	-55,229
Income tax benefit (provision)	0	0
Earnings from continuing operations	-57,820	-55,229
Earnings (loss) from discontinued operations, net of tax	0	13
Net earnings	-57,820	-55,216
Net loss attributable to noncontrolling interests	0	0
Net earnings attributable to IAC shareholders	-57,820	-55,216
Comprehensive income attributable to IAC shareholders	4,709	-59,268
IAC Consolidated
Condensed Financial Statements, Captions [Line Items]
Revenue	772,512	740,247
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	191,553	209,234
Selling and marketing expense	357,666	298,599
General and administrative expense	114,794	95,089
Product development expense	45,257	38,816
Depreciation	15,568	14,818
Amortization of intangibles	12,555	11,979
Total operating costs and expenses	737,393	668,535
Operating income	35,119	71,712
Equity in earnings of unconsolidated affiliates	0	0
Interest expense	-14,064	-14,064
Other income (expense), net	6,988	-1,958
Earnings from continuing operations before income taxes	28,043	55,690
Income tax benefit (provision)	-6,180	-21,385
Earnings from continuing operations	21,863	34,305
Earnings (loss) from discontinued operations, net of tax	125	-814
Net earnings	21,988	33,491
Net loss attributable to noncontrolling interests	4,417	2,394
Net earnings attributable to IAC shareholders	26,405	35,885
Comprehensive income attributable to IAC shareholders	($29,168)	$41,234

GUARANTOR_AND_NONGUARANTOR_FIN4

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details3) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities attributable to continuing operations	($3,810)	$42,641
Cash flows from investing activities attributable to continuing operations:
Acquisitions, net of cash acquired	-5,709	-77,981
Capital expenditures	-12,876	-9,721
Proceeds from maturities and sales of marketable debt securities	6,050	0
Purchases of marketable debt securities	-47,930	-32,848
Purchases of long-term investments	-8,345	-7,861
Other, net	2,843	-157
Net cash used in investing activities attributable to continuing operations	-65,967	-128,568
Cash flows from financing activities attributable to continuing operations:
Purchase of treasury stock	-200,000	0
Dividends	-28,675	-20,004
Issuance of common stock, net of withholding taxes	-10,339	920
Excess tax benefits from stock-based awards	16,846	24,203
Purchase of noncontrolling interests	-15,338	-30,000
Funds returned from escrow for Meetic tender offer	0	12,354
Acquisition-related contingent consideration payment	-180	0
Other, net	110	-295
Net cash used in financing activities attributable to continuing operations	-237,576	-12,822
Net Cash Provided by (Used in) Continuing Operations	-307,353	-98,749
Effect of exchange rate changes on cash and cash equivalents	-11,455	1,616
Net decrease in cash and cash equivalents	-318,808	-97,133
Cash and cash equivalents at beginning of period	990,405	1,100,444
Cash and cash equivalents at end of period	671,597	1,003,311
IAC
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities attributable to continuing operations	-53,803	-29,300
Cash flows from investing activities attributable to continuing operations:
Acquisitions, net of cash acquired	0	0
Capital expenditures	-935	-985
Proceeds from maturities and sales of marketable debt securities	6,050
Purchases of marketable debt securities	-47,930	32,848
Purchases of long-term investments	0	-3,000
Other, net	3,615	2
Net cash used in investing activities attributable to continuing operations	-39,200	-36,831
Cash flows from financing activities attributable to continuing operations:
Purchase of treasury stock	-200,000
Dividends	-28,675	-20,004
Issuance of common stock, net of withholding taxes	-10,339	920
Excess tax benefits from stock-based awards	16,715	15,610
Purchase of noncontrolling interests	0	0
Acquisition-related contingent consideration payment	0
Intercompany Financing Activites	18,083	-41,436
Other, net		-374
Net cash used in financing activities attributable to continuing operations	-204,216	-45,284
Net Cash Provided by (Used in) Continuing Operations	-297,219	-111,415
Effect of exchange rate changes on cash and cash equivalents	0	0
Net decrease in cash and cash equivalents	-297,219	-111,415
Cash and cash equivalents at beginning of period	766,076	782,022
Cash and cash equivalents at end of period	468,857	670,607
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities attributable to continuing operations	87,776	72,253
Cash flows from investing activities attributable to continuing operations:
Acquisitions, net of cash acquired	-3,002	-54,483
Capital expenditures	-8,530	-5,931
Proceeds from maturities and sales of marketable debt securities	0
Purchases of marketable debt securities	0	0
Purchases of long-term investments	0	-3,286
Other, net	-356	0
Net cash used in investing activities attributable to continuing operations	-11,888	-63,700
Cash flows from financing activities attributable to continuing operations:
Purchase of noncontrolling interests	0	-30,000
Acquisition-related contingent consideration payment	-180
Intercompany Financing Activites	-76,739	21,448
Net cash used in financing activities attributable to continuing operations	-76,919	-8,552
Net Cash Provided by (Used in) Continuing Operations	-1,031	1
Effect of exchange rate changes on cash and cash equivalents	10	-1
Net decrease in cash and cash equivalents	-1,021	0
Cash and cash equivalents at beginning of period	1,021	0
Cash and cash equivalents at end of period	0	0
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities attributable to continuing operations	-37,783	-312
Cash flows from investing activities attributable to continuing operations:
Acquisitions, net of cash acquired	-2,707	-23,498
Capital expenditures	-3,411	-2,805
Proceeds from maturities and sales of marketable debt securities	0
Purchases of marketable debt securities	0	0
Purchases of long-term investments	-8,345	-1,575
Other, net	-416	-159
Net cash used in investing activities attributable to continuing operations	-14,879	-28,037
Cash flows from financing activities attributable to continuing operations:
Excess tax benefits from stock-based awards	131	8,593
Purchase of noncontrolling interests	-15,338	0
Funds returned from escrow for Meetic tender offer		12,354
Acquisition-related contingent consideration payment	0
Intercompany Financing Activites	58,656	19,988
Other, net	110	79
Net cash used in financing activities attributable to continuing operations	43,559	41,014
Net Cash Provided by (Used in) Continuing Operations	-9,103	12,665
Effect of exchange rate changes on cash and cash equivalents	-11,465	1,617
Net decrease in cash and cash equivalents	-20,568	14,282
Cash and cash equivalents at beginning of period	223,308	318,422
Cash and cash equivalents at end of period	202,740	332,704
IAC Consolidated
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities attributable to continuing operations	-3,810	42,641
Cash flows from investing activities attributable to continuing operations:
Acquisitions, net of cash acquired	-5,709	-77,981
Capital expenditures	-12,876	-9,721
Proceeds from maturities and sales of marketable debt securities	6,050
Purchases of marketable debt securities	-47,930	32,848
Purchases of long-term investments	-8,345	-7,861
Other, net	2,843	-157
Net cash used in investing activities attributable to continuing operations	-65,967	-128,568
Cash flows from financing activities attributable to continuing operations:
Purchase of treasury stock	-200,000
Dividends	-28,675	-20,004
Issuance of common stock, net of withholding taxes	-10,339	920
Excess tax benefits from stock-based awards	16,846	24,203
Purchase of noncontrolling interests	-15,338	-30,000
Funds returned from escrow for Meetic tender offer		12,354
Acquisition-related contingent consideration payment	-180
Intercompany Financing Activites	0	0
Other, net	110	-295
Net cash used in financing activities attributable to continuing operations	-237,576	-12,822
Net Cash Provided by (Used in) Continuing Operations	-307,353	-98,749
Effect of exchange rate changes on cash and cash equivalents	-11,455	1,616
Net decrease in cash and cash equivalents	-318,808	-97,133
Cash and cash equivalents at beginning of period	990,405	1,100,444
Cash and cash equivalents at end of period	$671,597	$1,003,311