v2.4.1.9

SEGMENT INFORMATION (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 830,754 us-gaap_Revenues | $ 782,231 us-gaap_Revenues | $ 756,315 us-gaap_Revenues | $ 740,247 us-gaap_Revenues | $ 724,455 us-gaap_Revenues | $ 756,872 us-gaap_Revenues | $ 799,411 us-gaap_Revenues | $ 742,249 us-gaap_Revenues | $ 3,109,547 us-gaap_Revenues | $ 3,022,987 us-gaap_Revenues | $ 2,800,933 us-gaap_Revenues
Adjusted EBITDA |  |  |  |  |  |  |  |  | 544,076 iaci_AdjustedEBITDA | 598,303 iaci_AdjustedEBITDA | 497,445 iaci_AdjustedEBITDA
Segment Assets | 2,028,016 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets |  |  |  | 2,114,025 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets |  |  |  | 2,028,016 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets | 2,114,025 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets |
Capital expenditures |  |  |  |  |  |  |  |  | 57,233 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 80,311 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 51,201 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Reconciliation of Adjusted EBITDA to operating income (loss) for the entity's reportable segments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Non-Cash Compensation Expense |  |  |  |  |  |  |  |  | (59,634)us-gaap_AllocatedShareBasedCompensationExpense | (53,005)us-gaap_AllocatedShareBasedCompensationExpense | (85,625)us-gaap_AllocatedShareBasedCompensationExpense
Depreciation |  |  |  |  |  |  |  |  | (61,156)us-gaap_Depreciation | (58,909)us-gaap_Depreciation | (52,481)us-gaap_Depreciation
Amortization of Intangibles |  |  |  |  |  |  |  |  | (57,926)us-gaap_AmortizationOfIntangibleAssets | (59,843)us-gaap_AmortizationOfIntangibleAssets | (35,771)us-gaap_AmortizationOfIntangibleAssets
Acquisition-related contingent consideration fair value adjustments |  |  |  |  |  |  |  |  | 13,367 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | (343)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | 0 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Operating income | 110,372 us-gaap_OperatingIncomeLoss | 100,953 us-gaap_OperatingIncomeLoss | 95,690 us-gaap_OperatingIncomeLoss | 71,712 us-gaap_OperatingIncomeLoss | 112,952 us-gaap_OperatingIncomeLoss | 122,004 us-gaap_OperatingIncomeLoss | 106,696 us-gaap_OperatingIncomeLoss | 84,551 us-gaap_OperatingIncomeLoss | 378,727 us-gaap_OperatingIncomeLoss | 426,203 us-gaap_OperatingIncomeLoss | 323,568 us-gaap_OperatingIncomeLoss
Reconciliation of segment assets to total assets |  |  |  |  |  |  |  |  |  |  |
Segment Assets | 2,028,016 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets |  |  |  | 2,114,025 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets |  |  |  | 2,028,016 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets | 2,114,025 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets |
Goodwill | 1,754,926 us-gaap_Goodwill |  |  |  | 1,675,323 us-gaap_Goodwill |  |  |  | 1,754,926 us-gaap_Goodwill | 1,675,323 us-gaap_Goodwill | 1,616,154 us-gaap_Goodwill
Indefinite-Lived Intangible Assets | 405,234 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |  |  |  | 376,329 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |  |  |  | 405,234 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill | 376,329 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |
Definite-Lived Intangible Assets | 86,702 us-gaap_FiniteLivedIntangibleAssetsNet |  |  |  | 69,007 us-gaap_FiniteLivedIntangibleAssetsNet |  |  |  | 86,702 us-gaap_FiniteLivedIntangibleAssetsNet | 69,007 us-gaap_FiniteLivedIntangibleAssetsNet |
TOTAL ASSETS | 4,274,878 us-gaap_Assets |  |  |  | 4,234,684 us-gaap_Assets |  |  |  | 4,274,878 us-gaap_Assets | 4,234,684 us-gaap_Assets |
Search & Applications |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,596,251 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | 1,604,950 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | 1,465,795 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember
Adjusted EBITDA |  |  |  |  |  |  |  |  | 362,029 iaci_AdjustedEBITDA / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | 385,851 iaci_AdjustedEBITDA / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | 328,141 iaci_AdjustedEBITDA / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember
Segment Assets | 341,886 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |  |  |  | 409,116 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |  |  |  | 341,886 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | 409,116 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |
Capital expenditures |  |  |  |  |  |  |  |  | 17,701 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | 22,215 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | 15,320 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember
Reconciliation of Adjusted EBITDA to operating income (loss) for the entity's reportable segments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Non-Cash Compensation Expense |  |  |  |  |  |  |  |  |  | (3)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | (34)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember
Depreciation |  |  |  |  |  |  |  |  | (16,461)us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | (18,177)us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | (14,995)us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember
Amortization of Intangibles |  |  |  |  |  |  |  |  | (33,902)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | (27,554)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | (7,468)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember
Acquisition-related contingent consideration fair value adjustments |  |  |  |  |  |  |  |  | (326)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |  |
Operating income |  |  |  |  |  |  |  |  | 311,340 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | 340,117 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | 305,644 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember
Reconciliation of segment assets to total assets |  |  |  |  |  |  |  |  |  |  |
Segment Assets | 341,886 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |  |  |  | 409,116 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |  |  |  | 341,886 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | 409,116 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |
Goodwill | 774,822 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |  |  |  | 738,062 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |  |  |  | 774,822 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | 738,062 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | 723,650 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember
Indefinite-Lived Intangible Assets | 211,095 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |  |  |  | 195,805 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |  |  |  | 211,095 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | 195,805 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |
Definite-Lived Intangible Assets | 44,355 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |  |  |  | 40,550 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |  |  |  | 44,355 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | 40,550 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |
TOTAL ASSETS | 1,372,158 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |  |  |  | 1,383,533 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |  |  |  | 1,372,158 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember | 1,383,533 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |
The Match Group |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 897,245 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | 805,390 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | 714,222 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember
Adjusted EBITDA |  |  |  |  |  |  |  |  | 264,736 iaci_AdjustedEBITDA / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | 266,949 iaci_AdjustedEBITDA / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | 236,778 iaci_AdjustedEBITDA / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember
Segment Assets | 297,166 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember |  |  |  | 341,377 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember |  |  |  | 297,166 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | 341,377 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember |
Capital expenditures |  |  |  |  |  |  |  |  | 22,105 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | 19,997 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | 19,853 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember
Reconciliation of Adjusted EBITDA to operating income (loss) for the entity's reportable segments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Non-Cash Compensation Expense |  |  |  |  |  |  |  |  | 287 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | (1,122)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | (2,818)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember
Depreciation |  |  |  |  |  |  |  |  | (25,628)us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | (20,203)us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | (16,339)us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember
Amortization of Intangibles |  |  |  |  |  |  |  |  | (11,395)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | (17,126)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | (17,455)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember
Acquisition-related contingent consideration fair value adjustments |  |  |  |  |  |  |  |  | 12,912 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | (343)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember |
Operating income |  |  |  |  |  |  |  |  | 240,912 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | 228,155 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | 200,166 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember
Reconciliation of segment assets to total assets |  |  |  |  |  |  |  |  |  |  |
Segment Assets | 297,166 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember |  |  |  | 341,377 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember |  |  |  | 297,166 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | 341,377 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember |
Goodwill | 798,797 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember |  |  |  | 775,403 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember |  |  |  | 798,797 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | 775,403 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | 718,736 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember
Indefinite-Lived Intangible Assets | 180,558 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember |  |  |  | 167,544 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember |  |  |  | 180,558 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | 167,544 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember |
Definite-Lived Intangible Assets | 27,055 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember |  |  |  | 11,818 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember |  |  |  | 27,055 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | 11,818 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember |
TOTAL ASSETS | 1,303,576 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember |  |  |  | 1,296,142 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember |  |  |  | 1,303,576 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember | 1,296,142 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iaci_TheMatchGroupMember |
Media |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 181,780 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | 191,434 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | 164,051 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember
Adjusted EBITDA |  |  |  |  |  |  |  |  | (36,720)iaci_AdjustedEBITDA / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | (16,976)iaci_AdjustedEBITDA / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | (38,555)iaci_AdjustedEBITDA / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember
Segment Assets | 87,448 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |  |  |  | 92,500 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |  |  |  | 87,448 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | 92,500 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |
Capital expenditures |  |  |  |  |  |  |  |  | 1,566 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | 1,197 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | 1,178 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember
Reconciliation of Adjusted EBITDA to operating income (loss) for the entity's reportable segments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Non-Cash Compensation Expense |  |  |  |  |  |  |  |  | (647)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | (633)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | (770)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember
Depreciation |  |  |  |  |  |  |  |  | (927)us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | (2,124)us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | (1,398)us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember
Amortization of Intangibles |  |  |  |  |  |  |  |  | (2,098)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | (1,070)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | (6,179)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember
Acquisition-related contingent consideration fair value adjustments |  |  |  |  |  |  |  |  | 215 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |  |
Operating income |  |  |  |  |  |  |  |  | (40,177)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | (20,803)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | (46,902)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember
Reconciliation of segment assets to total assets |  |  |  |  |  |  |  |  |  |  |
Segment Assets | 87,448 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |  |  |  | 92,500 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |  |  |  | 87,448 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | 92,500 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |
Goodwill | 8,267 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |  |  |  | 8,267 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |  |  |  | 8,267 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | 8,267 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |
Indefinite-Lived Intangible Assets | 1,800 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |  |  |  | 1,800 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |  |  |  | 1,800 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | 1,800 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |
Definite-Lived Intangible Assets | 4,900 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |  |  |  | 944 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |  |  |  | 4,900 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | 944 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |
TOTAL ASSETS | 102,415 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |  |  |  | 103,511 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |  |  |  | 102,415 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember | 103,511 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iaci_MediaMember |
Total eCommerce |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 435,361 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | 422,066 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | 457,182 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember
Adjusted EBITDA |  |  |  |  |  |  |  |  | 17,282 iaci_AdjustedEBITDA / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | 22,890 iaci_AdjustedEBITDA / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | 31,200 iaci_AdjustedEBITDA / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember
Segment Assets | 50,133 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember |  |  |  | 41,827 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember |  |  |  | 50,133 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | 41,827 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember |
Capital expenditures |  |  |  |  |  |  |  |  | 9,620 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | 8,921 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | 8,485 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember
Reconciliation of Adjusted EBITDA to operating income (loss) for the entity's reportable segments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Non-Cash Compensation Expense |  |  |  |  |  |  |  |  | (559)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | 29 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | 2 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember
Depreciation |  |  |  |  |  |  |  |  | (8,015)us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | (8,887)us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | (11,210)us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember
Amortization of Intangibles |  |  |  |  |  |  |  |  | (10,531)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | (14,093)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | (4,669)us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember
Acquisition-related contingent consideration fair value adjustments |  |  |  |  |  |  |  |  | 566 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember |  |
Operating income |  |  |  |  |  |  |  |  | (1,257)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | (61)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | 15,323 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember
Reconciliation of segment assets to total assets |  |  |  |  |  |  |  |  |  |  |
Segment Assets | 50,133 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember |  |  |  | 41,827 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember |  |  |  | 50,133 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | 41,827 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember |
Goodwill | 173,040 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember |  |  |  | 153,591 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember |  |  |  | 173,040 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | 153,591 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | 165,501 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember
Indefinite-Lived Intangible Assets | 11,781 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember |  |  |  | 11,180 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember |  |  |  | 11,781 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | 11,180 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember |
Definite-Lived Intangible Assets | 10,392 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember |  |  |  | 15,695 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember |  |  |  | 10,392 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | 15,695 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember |
TOTAL ASSETS | 245,346 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember |  |  |  | 222,293 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember |  |  |  | 245,346 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember | 222,293 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iaci_ECommerceMember |
Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | (1,090)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (853)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (317)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  | (63,251)iaci_AdjustedEBITDA / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (60,411)iaci_AdjustedEBITDA / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (60,119)iaci_AdjustedEBITDA / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Segment Assets | 1,251,383 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |  |  | 1,229,205 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |  |  | 1,251,383 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 1,229,205 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |
Capital expenditures |  |  |  |  |  |  |  |  | 6,241 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 27,981 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 6,365 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Reconciliation of Adjusted EBITDA to operating income (loss) for the entity's reportable segments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Non-Cash Compensation Expense |  |  |  |  |  |  |  |  | (58,715)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (51,276)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (82,005)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Depreciation |  |  |  |  |  |  |  |  | (10,125)us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (9,518)us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (8,539)us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Acquisition-related contingent consideration fair value adjustments |  |  |  |  |  |  |  |  | 0 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |
Operating income |  |  |  |  |  |  |  |  | (132,091)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (121,205)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (150,663)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Reconciliation of segment assets to total assets |  |  |  |  |  |  |  |  |  |  |
Segment Assets | 1,251,383 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |  |  | 1,229,205 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |  |  | 1,251,383 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 1,229,205 iaci_SegmentAssetsExcludingGoodwillAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |
TOTAL ASSETS | $ 1,251,383 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |  |  | $ 1,229,205 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |  |  | $ 1,251,383 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | $ 1,229,205 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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