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Subsequent Events (Details) $ in Thousands	1 Months Ended	6 Months Ended
	Aug. 11, 2017 USD ($) ft² Properties	Jun. 30, 2017 USD ($) ft² Properties	Jun. 30, 2016 USD ($) Properties
Subsequent Event [Line Items]
Gross disposition price			$ 1,728,600
Retail [Member]
Subsequent Event [Line Items]
Number of disposed assets | Properties		3	18
Square Footage | ft²		742,000
Gross disposition price		$ 99,330
Retail [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Number of disposed assets | Properties	2
Square Footage | ft²	358,000
Gross disposition price	$ 31,950

X

- Definition

Discontinued operation, gross disposition price

+ References

No definition available.

+ Details

Name:	ivtp_DiscontinuedOperationGrossDispositionPrice
Namespace Prefix:	ivtp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Number of disposed assets.

+ References

No definition available.

+ Details

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

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_RetailSiteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: