Name:	itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationPlansExercisePriceRangeNumberOfExercisableShares
Namespace Prefix:	itic_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Share-based Compensation, Shares Authorized under Stock Appreciation Rights Plans, Exercise Price Range, Exercisable Shares, Weighted Average Exercise Price

No definition available.

Name:	itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeExercisableSharesWeightedAverageExercisePrice
Namespace Prefix:	itic_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Share-based Compensation, Shares Authorized under Stock Appreciation Rights Plans, Exercise Price Range, Lower Range Limit

No definition available.

Name:	itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix:	itic_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Share-based Compensation, Shares Authorized under Stock Appreciation Rights Plans, Exercise Price Range, Number of Outstanding Shares

No definition available.

Name:	itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeNumberOfOutstandingShares
Namespace Prefix:	itic_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Share-based Compensation, Shares Authorized under Stock Appreciation Rights Plans, Exercise Price Range, Outstanding Shares, Weighted Average Exercise Price

No definition available.

Name:	itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeOutstandingAwardsWeightedAverageExercisePrice
Namespace Prefix:	itic_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Share-based Compensation, Shares Authorized under Stock Appreciation Rights Plans, Exercise Price Range, Outstanding Shares, Weighted Average Remaining Contractual Term

No definition available.

Name:	itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeOutstandingSharesWeightedAverageRemainingContractualTerm
Namespace Prefix:	itic_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Share-based Compensation, Shares Authorized under Stock Appreciation Rights Plans, Exercise Price Range, Upper Range Limit

No definition available.

Name:	itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix:	itic_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

Name:	us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a, b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

Name:	us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Name:	us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.