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Subsequent Events update (Details) ft² in Thousands, $ in Thousands	1 Months Ended	3 Months Ended
	May 09, 2018 USD ($) ft² Property	Mar. 31, 2018 USD ($) ft²	Mar. 31, 2017 USD ($) ft²	Dec. 31, 2017 ft²
Subsequent Event [Line Items]
Number of disposed properties		18,280
Square Feet | ft²		3,000	300	3,200
Gross disposition price		$ 127,500	$ 29,050
Subsequent Event
Subsequent Event [Line Items]
Number of disposed properties | Property	1
Square Feet | ft²	45
Gross disposition price	$ 10,000

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 Properties

+ References

No definition available.

+ Details

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