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Earnings Per Common Share and Share Awards (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Earnings Per Common Share And Share Awards [Line Items] |  |  |
Incremental dilutive potential common shares, calculated using treasury stock method (in shares) | 5,774us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 20,459us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 35,090us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Anti-dilutive shares excluded from computation of diluted earnings per share | 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
SARs and options vesting period | 1 year |  |
Intrinsic values of options exercised | $ 82,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | $ 3,486,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | $ 153,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Options and SARs vested | 4,125itic_ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsAndEquityInstrumentsOtherThanOptionsVestedInPeriod |  |
Fair value of options and SARs vested | 118,462itic_ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsAndEquityInstrumentsOtherThanOptionsVestedInPeriodFairValue |  |
Weighted-average fair values for SARs issued (dollars per share) | $ 28.98us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 27.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 18.84us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Compensation expense relating to SARs or options vesting | 121,000us-gaap_AllocatedShareBasedCompensationExpense | 84,000us-gaap_AllocatedShareBasedCompensationExpense | 75,000us-gaap_AllocatedShareBasedCompensationExpense
Total unrecognized compensation cost related to unvested share-based compensation arrangements granted under stock award plans | $ 33,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |
Weighted-average period of unrecognized compensation cost recognition | 3 months |  |
Number of stock options or SARs granted where exercise price was less than market price on date of grant | 0itic_NumberOfStockOptionsOrSarsGrantedWhereExercisePriceWasLessThanMarketPriceOnDateOfGrant |  |
Minimum |  |  |
Earnings Per Common Share And Share Awards [Line Items] |  |  |
Annual rate at which stock appreciation rights and options are exercisable and vest | 10.00%itic_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfExercisableAndVestingPeriod / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
SARs and options expiration period | 5 years |  |
Maximum |  |  |
Earnings Per Common Share And Share Awards [Line Items] |  |  |
Maximum shares of Company stock to be granted to key employees or directors | 500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Annual rate at which stock appreciation rights and options are exercisable and vest | 20.00%itic_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfExercisableAndVestingPeriod / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
SARs and options expiration period | 10 years |  |

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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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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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