v2.4.1.9

GUARANTOR AND NONGUARANTOR FINANCIAL INFORMATION (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 990,405 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 1,100,444 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 749,977 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 704,153 us-gaap_CashAndCashEquivalentsAtCarryingValue
Marketable securities | 160,648 us-gaap_AvailableForSaleSecuritiesCurrent | 6,004 us-gaap_AvailableForSaleSecuritiesCurrent |  |
Accounts receivable | 236,086 us-gaap_AccountsReceivableNetCurrent | 207,408 us-gaap_AccountsReceivableNetCurrent |  |
Other current assets | 166,742 us-gaap_OtherAssetsCurrent | 161,530 us-gaap_OtherAssetsCurrent |  |
Property and equipment, net | 302,459 us-gaap_PropertyPlantAndEquipmentNet | 293,964 us-gaap_PropertyPlantAndEquipmentNet |  |
Goodwill | 1,754,926 us-gaap_Goodwill | 1,675,323 us-gaap_Goodwill | 1,616,154 us-gaap_Goodwill |
Intangible assets, net | 491,936 us-gaap_IntangibleAssetsNetExcludingGoodwill | 445,336 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |
Other non-current assets | 56,693 us-gaap_OtherAssetsNoncurrent | 164,685 us-gaap_OtherAssetsNoncurrent |  |
TOTAL ASSETS | 4,274,878 us-gaap_Assets | 4,234,684 us-gaap_Assets |  |
Accounts payable, trade | 81,163 us-gaap_AccountsPayableTradeCurrent | 77,653 us-gaap_AccountsPayableTradeCurrent |  |
Long-term debt | 1,080,000 us-gaap_LongTermDebt | 1,080,000 us-gaap_LongTermDebt |  |
Income taxes payable | 32,635 us-gaap_AccruedIncomeTaxesNoncurrent | 416,384 us-gaap_AccruedIncomeTaxesNoncurrent |  |
Other long-term liabilities | 45,191 us-gaap_OtherLiabilitiesNoncurrent | 58,393 us-gaap_OtherLiabilitiesNoncurrent |  |
Redeemable noncontrolling interests | 40,427 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount | 42,861 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount |  |
Total IAC shareholders' equity | 1,991,953 us-gaap_StockholdersEquity | 1,686,736 us-gaap_StockholdersEquity |  |
Noncontrolling interests | 1,189 us-gaap_MinorityInterest | 42,665 us-gaap_MinorityInterest |  |
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY | 4,274,878 us-gaap_LiabilitiesAndStockholdersEquity | 4,234,684 us-gaap_LiabilitiesAndStockholdersEquity |  |
IAC |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 766,076 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 782,022 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 501,075 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 545,222 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Marketable securities | 159,197 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,007 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accounts receivable | 13 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 38 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other current assets | 23,923 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 45,111 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Intercompany receivables | 0 us-gaap_DueFromAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_DueFromAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Property and equipment, net | 4,950 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,316 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Goodwill | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Intangible assets, net | 0 us-gaap_IntangibleAssetsNetExcludingGoodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_IntangibleAssetsNetExcludingGoodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Equity Method Investments | 5,035,304 us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,833,751 us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other non-current assets | 44,610 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 83,207 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
TOTAL ASSETS | 6,034,073 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,750,452 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accounts payable, trade | 3,059 us-gaap_AccountsPayableTradeCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,310 us-gaap_AccountsPayableTradeCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other current liabilities | 73,491 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 41,623 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Long-term debt | 1,000,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,000,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Income taxes payable | 2,240 us-gaap_AccruedIncomeTaxesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 383,926 us-gaap_AccruedIncomeTaxesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Intercompany liabilities | 2,659,213 us-gaap_DueToAffiliateCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,416,453 us-gaap_DueToAffiliateCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other long-term liabilities | 304,117 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 217,404 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Redeemable noncontrolling interests | 0 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total IAC shareholders' equity | 1,991,953 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,686,736 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Noncontrolling interests | 0 us-gaap_MinorityInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_MinorityInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY | 6,034,073 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,750,452 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Guarantor Subsidiaries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 1,021 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Marketable securities | 0 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Accounts receivable | 155,262 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 135,651 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other current assets | 91,105 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 76,572 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Intercompany receivables | 1,688,403 us-gaap_DueFromAffiliates / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 569,030 us-gaap_DueFromAffiliates / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Property and equipment, net | 232,819 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 221,386 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Goodwill | 1,249,807 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,180,159 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Intangible assets, net | 325,771 us-gaap_IntangibleAssetsNetExcludingGoodwill / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 302,082 us-gaap_IntangibleAssetsNetExcludingGoodwill / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Equity Method Investments | 930,443 us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 782,840 us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other non-current assets | 20,682 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 15,521 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
TOTAL ASSETS | 4,695,313 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 3,283,241 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Accounts payable, trade | 55,320 us-gaap_AccountsPayableTradeCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 51,525 us-gaap_AccountsPayableTradeCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other current liabilities | 328,920 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 280,549 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Long-term debt | 80,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 80,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Income taxes payable | 4,771 us-gaap_AccruedIncomeTaxesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 6,768 us-gaap_AccruedIncomeTaxesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Intercompany liabilities | 0 us-gaap_DueToAffiliateCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_DueToAffiliateCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other long-term liabilities | 104,219 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 96,239 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Redeemable noncontrolling interests | 0 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total IAC shareholders' equity | 4,122,083 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 2,768,160 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Noncontrolling interests | 0 us-gaap_MinorityInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_MinorityInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY | 4,695,313 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 3,283,241 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Non-Guarantor Subsidiaries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 223,308 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 318,422 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 248,902 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 158,931 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Marketable securities | 1,451 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 4,997 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Accounts receivable | 80,811 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 71,719 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Other current assets | 57,487 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 40,661 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Intercompany receivables | 970,810 us-gaap_DueFromAffiliates / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 847,423 us-gaap_DueFromAffiliates / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Property and equipment, net | 64,690 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 67,262 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Goodwill | 505,119 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 495,164 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Intangible assets, net | 166,165 us-gaap_IntangibleAssetsNetExcludingGoodwill / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 143,254 us-gaap_IntangibleAssetsNetExcludingGoodwill / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Equity Method Investments | 0 us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Other non-current assets | 109,372 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 252,576 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
TOTAL ASSETS | 2,179,213 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 2,241,478 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Accounts payable, trade | 22,784 us-gaap_AccountsPayableTradeCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 21,818 us-gaap_AccountsPayableTradeCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Other current liabilities | 191,197 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 187,072 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Long-term debt | 0 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Income taxes payable | 25,624 us-gaap_AccruedIncomeTaxesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 25,690 us-gaap_AccruedIncomeTaxesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Intercompany liabilities | 0 us-gaap_DueToAffiliateCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_DueToAffiliateCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Other long-term liabilities | 54,328 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 72,941 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Redeemable noncontrolling interests | 40,427 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 42,861 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Total IAC shareholders' equity | 1,843,664 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 1,848,431 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Noncontrolling interests | 1,189 us-gaap_MinorityInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 42,665 us-gaap_MinorityInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY | 2,179,213 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 2,241,478 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
IAC Consolidated |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 990,405 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 1,100,444 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 749,977 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 704,153 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Marketable securities | 160,648 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 6,004 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
Accounts receivable | 236,086 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 207,408 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
Other current assets | 166,742 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 161,530 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
Intercompany receivables | 0 us-gaap_DueFromAffiliates / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 0 us-gaap_DueFromAffiliates / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
Property and equipment, net | 302,459 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 293,964 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
Goodwill | 1,754,926 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 1,675,323 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
Intangible assets, net | 491,936 us-gaap_IntangibleAssetsNetExcludingGoodwill / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 445,336 us-gaap_IntangibleAssetsNetExcludingGoodwill / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
Equity Method Investments | 0 us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 0 us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
Other non-current assets | 171,676 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 344,675 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
TOTAL ASSETS | 4,274,878 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 4,234,684 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
Accounts payable, trade | 81,163 us-gaap_AccountsPayableTradeCurrent / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 77,653 us-gaap_AccountsPayableTradeCurrent / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
Other current liabilities | 592,791 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 509,244 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
Long-term debt | 1,080,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 1,080,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
Income taxes payable | 32,635 us-gaap_AccruedIncomeTaxesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 416,384 us-gaap_AccruedIncomeTaxesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
Intercompany liabilities | 0 us-gaap_DueToAffiliateCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 0 us-gaap_DueToAffiliateCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
Other long-term liabilities | 454,720 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 379,141 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
Redeemable noncontrolling interests | 40,427 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 42,861 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
Total IAC shareholders' equity | 1,991,953 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 1,686,736 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
Noncontrolling interests | 1,189 us-gaap_MinorityInterest / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 42,665 us-gaap_MinorityInterest / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY | 4,274,878 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember | 4,234,684 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember |  |
Eliminations |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Marketable securities | 0 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Accounts receivable | 0 us-gaap_AccountsReceivableNetCurrent / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_AccountsReceivableNetCurrent / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Other current assets | (5,773)us-gaap_OtherAssetsCurrent / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (814)us-gaap_OtherAssetsCurrent / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Intercompany receivables | (2,659,213)us-gaap_DueFromAffiliates / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (1,416,453)us-gaap_DueFromAffiliates / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Property and equipment, net | 0 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Goodwill | 0 us-gaap_Goodwill / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_Goodwill / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Intangible assets, net | 0 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Equity Method Investments | (5,965,747)us-gaap_EquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (4,616,591)us-gaap_EquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Other non-current assets | (2,988)us-gaap_OtherAssetsNoncurrent / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (6,629)us-gaap_OtherAssetsNoncurrent / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
TOTAL ASSETS | (8,633,721)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (6,040,487)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Accounts payable, trade | 0 us-gaap_AccountsPayableTradeCurrent / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_AccountsPayableTradeCurrent / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Other current liabilities | (817)us-gaap_OtherLiabilitiesCurrent / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_OtherLiabilitiesCurrent / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Long-term debt | 0 us-gaap_LongTermDebt / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_LongTermDebt / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Income taxes payable | 0 us-gaap_AccruedIncomeTaxesNoncurrent / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_AccruedIncomeTaxesNoncurrent / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Intercompany liabilities | (2,659,213)us-gaap_DueToAffiliateCurrentAndNoncurrent / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (1,416,453)us-gaap_DueToAffiliateCurrentAndNoncurrent / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Other long-term liabilities | (7,944)us-gaap_OtherLiabilitiesNoncurrent / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (7,443)us-gaap_OtherLiabilitiesNoncurrent / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Redeemable noncontrolling interests | 0 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Total IAC shareholders' equity | (5,965,747)us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (4,616,591)us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Noncontrolling interests | 0 us-gaap_MinorityInterest / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_MinorityInterest / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY | $ (8,633,721)us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | $ (6,040,487)us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |

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