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Reserves for Claims Summary Of The Company's Loss Reserves (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract] |  |  |  |
Known title claims | $ 5,364,645us-gaap_LiabilityForTitleClaimsAndClaimsAdjustmentExpenseKnownClaims | $ 4,670,809us-gaap_LiabilityForTitleClaimsAndClaimsAdjustmentExpenseKnownClaims |  |
IBNR | 31,312,355us-gaap_LiabilityForTitleClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNR | 30,689,191us-gaap_LiabilityForTitleClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNR |  |
Total loss reserves | $ 36,677,000us-gaap_LiabilityForTitleClaimsAndClaimsAdjustmentExpense | $ 35,360,000us-gaap_LiabilityForTitleClaimsAndClaimsAdjustmentExpense | $ 39,078,000us-gaap_LiabilityForTitleClaimsAndClaimsAdjustmentExpense | $ 37,996,000us-gaap_LiabilityForTitleClaimsAndClaimsAdjustmentExpense
% of Known title claims | 14.60%itic_LiabilityForTitleClaimsAndClaimsAdjustmentExpenseKnownClaimsPercentage | 13.20%itic_LiabilityForTitleClaimsAndClaimsAdjustmentExpenseKnownClaimsPercentage |  |
% of IBNR | 85.40%itic_LiabilityForTitleClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedPercentage | 86.80%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_
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- Definition Liability for title claims and claims adjustment expense known claims percentage. + References No definition available. + Details
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Namespace Prefix: | itic_
Data Type: | num:percentItemType
Balance Type: | na
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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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- 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 The amount needed to reflect the estimated ultimate cost of settling 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),(b) -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Incurred-but-Not-Reported Claims -URI http://asc.fasb.org/extlink&oid=6515591 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 25 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6482024&loc=d3e12997-158429 + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to an assertion by the insureds of 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 25 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6482024&loc=d3e12997-158429 Reference 2: 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 Reference 3: 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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