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Investments in Securities and Fair Value Schedule of Gross Realized Gains (Losses) on Securities (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross realized gains | $ 1,028,133us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | $ 369,673us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | $ 714,168us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses | (524,396)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | (180,169)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | (185,411)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Net realized gain | 503,737us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | 189,504us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | 528,757us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Impairments of other assets and investments | (10,062)us-gaap_OtherAssetImpairmentCharges | (34,070)us-gaap_OtherAssetImpairmentCharges | (6,504)us-gaap_OtherAssetImpairmentCharges
Net gain on other assets and investments | 45,288itic_GainsonOtherAssetsandInvestments | 48,946itic_GainsonOtherAssetsandInvestments | 543,986itic_GainsonOtherAssetsandInvestments
Net loss on other assets and investments | (270,669)itic_RealizedLossesonOtherAssetsandInvestments | (8,580)itic_RealizedLossesonOtherAssetsandInvestments | 0itic_RealizedLossesonOtherAssetsandInvestments
Realized Investment Gains (Losses) | (235,443)us-gaap_RealizedInvestmentGainsLosses | 6,296us-gaap_RealizedInvestmentGainsLosses | 537,482us-gaap_RealizedInvestmentGainsLosses
Gain (Loss) on Investments | 268,294us-gaap_GainLossOnInvestments | 195,800us-gaap_GainLossOnInvestments | 1,066,239us-gaap_GainLossOnInvestments
General obligations of U.S. states, territories and political subdivisions |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross realized gains | 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember | 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember | 250us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember
Corporate debt securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross realized gains | 6,670us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 52,396us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Common stocks and nonredeemable preferred stocks |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross realized gains | 1,021,463us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CommonStocksAndNonredeemablePreferredStocksMember | 369,673us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CommonStocksAndNonredeemablePreferredStocksMember | 450,461us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CommonStocksAndNonredeemablePreferredStocksMember
Gross realized losses | (509,854)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CommonStocksAndNonredeemablePreferredStocksMember | (180,169)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CommonStocksAndNonredeemablePreferredStocksMember | (91,975)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CommonStocksAndNonredeemablePreferredStocksMember
Auction rate securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross realized gains | 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 211,061us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Other Than Temporary Impairment Of Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross realized losses | $ (14,542)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_OtherThanTemporaryImpairmentOfSecuritiesMember | $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_OtherThanTemporaryImpairmentOfSecuritiesMember | $ (93,436)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_OtherThanTemporaryImpairmentOfSecuritiesMember

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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