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Schedule II - Condensed Statement of Income (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items] |  |  |
Investment income – interest and dividends | $ 4,259,501us-gaap_InvestmentIncomeInterestAndDividend | $ 3,894,608us-gaap_InvestmentIncomeInterestAndDividend | $ 3,980,411us-gaap_InvestmentIncomeInterestAndDividend
Net realized gain (loss) on investments | 268,294us-gaap_GainLossOnInvestments | 195,800us-gaap_GainLossOnInvestments | 1,066,239us-gaap_GainLossOnInvestments
Other | 8,627,935us-gaap_OtherIncome | 8,274,823us-gaap_OtherIncome | 7,701,340us-gaap_OtherIncome
Total Revenues | 123,119,286us-gaap_Revenues | 126,251,497us-gaap_Revenues | 115,079,092us-gaap_Revenues
Salaries, employee benefits and payroll taxes | 25,218,225us-gaap_LaborAndRelatedExpense | 25,386,511us-gaap_LaborAndRelatedExpense | 21,881,540us-gaap_LaborAndRelatedExpense
Office occupancy and operations | 5,049,962itic_OfficeOccupancyAndOperations | 4,430,220itic_OfficeOccupancyAndOperations | 3,994,244itic_OfficeOccupancyAndOperations
Business development | 2,333,491us-gaap_BusinessDevelopment | 2,145,639us-gaap_BusinessDevelopment | 1,856,848us-gaap_BusinessDevelopment
Professional and contract labor fees | 2,676,483us-gaap_ProfessionalFees | 2,171,606us-gaap_ProfessionalFees | 2,420,387us-gaap_ProfessionalFees
Other expenses | 820,882us-gaap_OtherCostAndExpenseOperating | 755,407us-gaap_OtherCostAndExpenseOperating | 615,053us-gaap_OtherCostAndExpenseOperating
Income before Income Taxes | 13,488,498us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 21,542,738us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 16,079,907us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
(Benefit) Provision for Income Taxes | 3,816,000us-gaap_IncomeTaxExpenseBenefit | 6,746,000us-gaap_IncomeTaxExpenseBenefit | 4,889,000us-gaap_IncomeTaxExpenseBenefit
Net Income | 9,672,498us-gaap_ProfitLoss | 14,796,738us-gaap_ProfitLoss | 11,190,907us-gaap_ProfitLoss
Net Income Attributable to Redeemable Noncontrolling Interest | (23,523)us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest | (88,528)us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest | (88,411)us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
Net Income Attributable to the Company | 9,648,975us-gaap_NetIncomeLoss | 14,708,210us-gaap_NetIncomeLoss | 11,102,496us-gaap_NetIncomeLoss
Basic Earnings per Common Share | $ 4.75us-gaap_EarningsPerShareBasic | $ 7.15us-gaap_EarningsPerShareBasic | $ 5.33us-gaap_EarningsPerShareBasic
Weighted Average Shares Outstanding – Basic | 2,031,760us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 2,056,169us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 2,081,703us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted Earnings per Common Share | $ 4.74us-gaap_EarningsPerShareDiluted | $ 7.08us-gaap_EarningsPerShareDiluted | $ 5.24us-gaap_EarningsPerShareDiluted
Weighted Average Shares Outstanding – Diluted | 2,037,534us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 2,076,628us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 2,116,793us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Common Stock, Dividends, Per Share, Declared | $ 0.32us-gaap_CommonStockDividendsPerShareDeclared | $ 0.32us-gaap_CommonStockDividendsPerShareDeclared | $ 0.29us-gaap_CommonStockDividendsPerShareDeclared
Parent Company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Investment income – interest and dividends | 482,711us-gaap_InvestmentIncomeInterestAndDividend / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 348,933us-gaap_InvestmentIncomeInterestAndDividend / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 520,511us-gaap_InvestmentIncomeInterestAndDividend / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net realized gain (loss) on investments | 9,169us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (50,778)us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 616,001us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Rental income | 772,256us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 748,764us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 736,159us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other | 59,569us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 68,966us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (62,253)us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total Revenues | 1,323,705us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,115,885us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,810,418us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Salaries, employee benefits and payroll taxes | 673,729us-gaap_LaborAndRelatedExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 576,429us-gaap_LaborAndRelatedExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 459,248us-gaap_LaborAndRelatedExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Office occupancy and operations | 270,881itic_OfficeOccupancyAndOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 408,373itic_OfficeOccupancyAndOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 390,227itic_OfficeOccupancyAndOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Business development | 49,059us-gaap_BusinessDevelopment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 45,022us-gaap_BusinessDevelopment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 25,909us-gaap_BusinessDevelopment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Taxes – other than payroll and income | 200,718us-gaap_TaxesOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 188,314us-gaap_TaxesOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 240,607us-gaap_TaxesOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Professional and contract labor fees | 192,064us-gaap_ProfessionalFees / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 351,093us-gaap_ProfessionalFees / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 245,398us-gaap_ProfessionalFees / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other expenses | 193,681us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 177,810us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 161,937us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total operating expenses | 1,580,132us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,747,041us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,523,326us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in Net Income of Affiliated Companies | 9,777,925us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 15,164,894us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,992,815us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before Income Taxes | 9,521,498us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14,533,738us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 11,279,907us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
(Benefit) Provision for Income Taxes | (151,000)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (263,000)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 89,000us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Income | 9,672,498us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14,796,738us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 11,190,907us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Income Attributable to Redeemable Noncontrolling Interest | (23,523)us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (88,528)us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (88,411)us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Income Attributable to the Company | $ 9,648,975us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 14,708,210us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 11,102,496us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Basic Earnings per Common Share | $ 4.75us-gaap_EarningsPerShareBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 7.15us-gaap_EarningsPerShareBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 5.33us-gaap_EarningsPerShareBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Weighted Average Shares Outstanding – Basic | 2,031,760us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,056,169us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,081,703us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Diluted Earnings per Common Share | $ 4.74us-gaap_EarningsPerShareDiluted / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 7.08us-gaap_EarningsPerShareDiluted / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 5.24us-gaap_EarningsPerShareDiluted / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Weighted Average Shares Outstanding – Diluted | 2,037,534us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,076,628us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,116,793us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Common Stock, Dividends, Per Share, Declared | $ 0.32us-gaap_CommonStockDividendsPerShareDeclared / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 0.32us-gaap_CommonStockDividendsPerShareDeclared / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 0.29us-gaap_CommonStockDividendsPerShareDeclared / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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