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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
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