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Earnings Per Common Share and Share Awards Summary of Information of Fixed Stock Options (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014
$36.79 - $36.79 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options exercise price, lower limit | $ 36.79us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockOptionsExercisePriceRange3Member
Options exercise price, upper limit | $ 36.79us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockOptionsExercisePriceRange3Member
Options Outstanding - Number Outstanding | 1,500us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockOptionsExercisePriceRange3Member
Options Outstanding - Weighted Average Remaining Contractual Life | 4 months 17 days
Options Outstanding - Weighted Average Exercise Price | $ 36.79us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockOptionsExercisePriceRange3Member
Options Exercisable - Number Exercisable | 1,500us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockOptionsExercisePriceRange3Member
Options Exercisable - Weighted Average Exercise Price | $ 36.79us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockOptionsExercisePriceRange3Member
$36.79 - $36.79 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options exercise price, lower limit | $ 36.79us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockOptionsExercisePriceRange4Member
Options exercise price, upper limit | $ 36.79us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockOptionsExercisePriceRange4Member
Options Outstanding - Number Outstanding | 1,500us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockOptionsExercisePriceRange4Member
Options Outstanding - Weighted Average Remaining Contractual Life | 4 months 17 days
Options Outstanding - Weighted Average Exercise Price | $ 36.79us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockOptionsExercisePriceRange4Member
Options Exercisable - Number Exercisable | 1,500us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockOptionsExercisePriceRange4Member
Options Exercisable - Weighted Average Exercise Price | $ 36.79us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockOptionsExercisePriceRange4Member
$32.00 - $33.30 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
SARs exercise price, lower limit | $ 32.00itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange1Member
SARs exercise price, upper limit | $ 33.30itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange1Member
SAR Outstanding - Number Outstanding | 2,000itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeNumberOfOutstandingShares / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange1Member
SARs Outstanding - Weighted Average Remaining Contractual Life | 1 year 4 months 20 days
SARs - Weighted Average Exercise Price | $ 32.00itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeOutstandingAwardsWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange1Member
SARs Exercisable - Number Exercisable | 2,000itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationPlansExercisePriceRangeNumberOfExercisableShares / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange1Member
SARs Exercisable - Weighted Average Exercise Price | $ 32.00itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeExercisableSharesWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange1Member
$33.31 - $41.49 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
SARs exercise price, lower limit | $ 33.31itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange2Member
SARs exercise price, upper limit | $ 41.49itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange2Member
SAR Outstanding - Number Outstanding | 2,500itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeNumberOfOutstandingShares / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange2Member
SARs Outstanding - Weighted Average Remaining Contractual Life | 2 years 4 months 17 days
SARs - Weighted Average Exercise Price | $ 33.31itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeOutstandingAwardsWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange2Member
SARs Exercisable - Number Exercisable | 2,500itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationPlansExercisePriceRangeNumberOfExercisableShares / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange2Member
SARs Exercisable - Weighted Average Exercise Price | $ 33.31itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeExercisableSharesWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange2Member
$41.50 - $71.59 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
SARs exercise price, lower limit | $ 41.50itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange4Member
SARs exercise price, upper limit | $ 71.59itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange4Member
SAR Outstanding - Number Outstanding | 15,000itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeNumberOfOutstandingShares / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange4Member
SARs Outstanding - Weighted Average Remaining Contractual Life | 4 years 5 months 23 days
SARs - Weighted Average Exercise Price | $ 58.33itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeOutstandingAwardsWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange4Member
SARs Exercisable - Number Exercisable | 13,875itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationPlansExercisePriceRangeNumberOfExercisableShares / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange4Member
SARs Exercisable - Weighted Average Exercise Price | $ 57.49itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeExercisableSharesWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange4Member
$32.00 - $71.59 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
SARs exercise price, lower limit | $ 32.00itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange5Member
SARs exercise price, upper limit | $ 71.59itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange5Member
SAR Outstanding - Number Outstanding | 19,500itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeNumberOfOutstandingShares / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange5Member
SARs Outstanding - Weighted Average Remaining Contractual Life | 3 years 10 months 20 days
SARs - Weighted Average Exercise Price | $ 52.42itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeOutstandingAwardsWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange5Member
SARs Exercisable - Number Exercisable | 18,375itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationPlansExercisePriceRangeNumberOfExercisableShares / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange5Member
SARs Exercisable - Weighted Average Exercise Price | $ 51.43itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeExercisableSharesWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = itic_StockAppreciationRightsExercisePriceRange5Member

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