Discounted Cash Flow Method, Term

No definition available.

Name:	ivtp_DiscountedCashFlowMethodTerm
Namespace Prefix:	ivtp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair Value Measurements.

+ References

No definition available.

+ Details

Name:	ivtp_FairValueMeasurementsAdditionalTextualAbstract
Namespace Prefix:	ivtp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Investment Property, Measurement Input

+ References

No definition available.

+ Details

Name:	ivtp_InvestmentPropertyMeasurementInput
Namespace Prefix:	ivtp_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of Retail Properties Impaired

+ References

No definition available.

+ Details

Name:	ivtp_NumberofRetailPropertiesImpaired
Namespace Prefix:	ivtp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Provision For Asset Impairment, Properties Affected

+ References

No definition available.

+ Details

Name:	ivtp_ProvisionForAssetImpairmentPropertiesAffected
Namespace Prefix:	ivtp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

+ Details

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 35
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=118954474&loc=d3e32787-111569

+ Details

Name:	us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ivtp_DowntownRailyardVentureLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ivtp_UnconsolidatedEntitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputCapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_RealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ivtp_NonRecurringMeasurementsAdditionalDisclosuresAxis=us-gaap_RealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_MortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=ivtp_MeasurementInputWeightedAverageEffectiveMarketrateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=srt_RetailSiteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Fair Value Measurements - Narrative (Details)	12 Months Ended
Fair Value Measurements - Narrative (Details)	Dec. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($) property	Dec. 31, 2017 USD ($)
Fair Value Measurements (Additional Textual) [Abstract]
Number of retail properties impaired \| property	1	3
Provision for asset impairment	$ 2,359,000	$ 3,510,000	$ 27,754,000
Impairment of investment in unconsolidated entities	0	29,933,000	0
Downtown Railyard Venture, LLC \| Unconsolidated Entities
Fair Value Measurements (Additional Textual) [Abstract]
Impairment of investment in unconsolidated entities		29,933,000
Fair Value, Measurements, Recurring \| Level 3
Fair Value Measurements (Additional Textual) [Abstract]
Recurring fair value measurements	0	0
Fair Value, Measurements, Nonrecurring
Fair Value Measurements (Additional Textual) [Abstract]
Provision for asset impairment	2,359,000	3,510,000	27,754,000
Impairment of investment in unconsolidated entities	$ 0	$ 29,933,000	$ 0
Fair Value, Measurements, Nonrecurring \| Minimum \| Capitalization Rate \| Real Estate \| Downtown Railyard Venture, LLC \| Unconsolidated Entities
Fair Value Measurements (Additional Textual) [Abstract]
Investment property, measurement input		0.0500
Fair Value, Measurements, Nonrecurring \| Minimum \| Measurement Input, Discount Rate \| Real Estate \| Downtown Railyard Venture, LLC \| Unconsolidated Entities
Fair Value Measurements (Additional Textual) [Abstract]
Investment property, measurement input		0.1000
Fair Value, Measurements, Nonrecurring \| Maximum \| Capitalization Rate \| Real Estate \| Downtown Railyard Venture, LLC \| Unconsolidated Entities
Fair Value Measurements (Additional Textual) [Abstract]
Investment property, measurement input		0.0800
Fair Value, Measurements, Nonrecurring \| Maximum \| Measurement Input, Discount Rate \| Real Estate \| Downtown Railyard Venture, LLC \| Unconsolidated Entities
Fair Value Measurements (Additional Textual) [Abstract]
Investment property, measurement input		0.3500
Fair Value, Measurements, Nonrecurring \| Real Estate
Fair Value Measurements (Additional Textual) [Abstract]
Discounted cash flow method, term		10 years
Fair Value, Measurements, Nonrecurring \| Real Estate \| Minimum \| Capitalization Rate
Fair Value Measurements (Additional Textual) [Abstract]
Investment property, measurement input		0.0700
Fair Value, Measurements, Nonrecurring \| Real Estate \| Minimum \| Measurement Input, Discount Rate
Fair Value Measurements (Additional Textual) [Abstract]
Investment property, measurement input		0.0800
Fair Value, Measurements, Nonrecurring \| Real Estate \| Maximum \| Capitalization Rate
Fair Value Measurements (Additional Textual) [Abstract]
Investment property, measurement input		0.0800
Fair Value, Measurements, Nonrecurring \| Real Estate \| Maximum \| Measurement Input, Discount Rate
Fair Value Measurements (Additional Textual) [Abstract]
Investment property, measurement input		0.0900
Mortgages \| Weighted Average Effective Market rate
Fair Value Measurements (Additional Textual) [Abstract]
Weighted average effective market interest rate	0.0371	0.0438
Line of Credit and Term Loan \| Measurement Input, Discount Rate
Fair Value Measurements (Additional Textual) [Abstract]
Weighted average effective market interest rate	0.0277	0.0363
Retail
Fair Value Measurements (Additional Textual) [Abstract]
Provision for asset impairment		$ 27,754,000
Retail \| Fair Value, Measurements, Nonrecurring \| Real Estate
Fair Value Measurements (Additional Textual) [Abstract]
Provision for asset impairment, properties affected \| property		6