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Reserves For Claims Summary Of The Company's Loss Reserves (Details) (USD $) | Mar. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract] |  |  |
Known title claims | $ 5,412,246 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseReportedClaimsAmount | $ 5,364,645 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseReportedClaimsAmount |
IBNR | 31,650,754 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNRClaimsAmount | 31,312,355 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNRClaimsAmount |
Total loss reserves | $ 37,063,000 us-gaap_LiabilityForTitleClaimsAndClaimsAdjustmentExpense | $ 36,677,000 us-gaap_LiabilityForTitleClaimsAndClaimsAdjustmentExpense | $ 35,360,000 us-gaap_LiabilityForTitleClaimsAndClaimsAdjustmentExpense
% of Known title claims | 14.60%itic_LiabilityForTitleClaimsAndClaimsAdjustmentExpenseKnownClaimsPercentage | 14.60%itic_LiabilityForTitleClaimsAndClaimsAdjustmentExpenseKnownClaimsPercentage |
% of IBNR | 85.40%itic_LiabilityForTitleClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedPercentage | 85.40%itic_LiabilityForTitleClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedPercentage |
% of Total loss reserves | 100.00%itic_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseReportedAndIncurredButNotReportedClaimsPercentage | 100.00%itic_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseReportedAndIncurredButNotReportedClaimsPercentage |

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- Definition Liability For Title Claims And Claims Adjustment Expense Incurred But Not Reported (IBNR) Percentage. + References No definition available. + Details
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Namespace Prefix: | itic_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Liability for title claims and claims adjustment expense known claims percentage. + References No definition available. + Details
Name: | itic_LiabilityForTitleClaimsAndClaimsAdjustmentExpenseKnownClaimsPercentage
Namespace Prefix: | itic_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Liability for unpaid claims and claims adjustment expense reported and incurred but not reported (IBNR) claims percentage. + References No definition available. + Details
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Namespace Prefix: | itic_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling asserted and unasserted claims estimated to have been incurred by the insureds on or before the balance sheet date pertaining to the existence of a lien, encumbrance, defect or other matter purportedly affecting the title to the interest as insured. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Liability for Claim Adjustment Expenses -URI http://asc.fasb.org/extlink&oid=6516805 + Details
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- Definition Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section W Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.W) -URI http://asc.fasb.org/extlink&oid=27015833&loc=d3e570705-122907 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Costs of settling insured claims and costs incurred in the claims settlement process for the specified year specifically for claims that have already been submitted to the insurance company for reimbursement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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