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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands		9 Months Ended
	Jun. 24, 2019	Sep. 30, 2019
Loss Contingencies [Line Items]
Losses from discontinued operations related to these claims		$ 25,500
Settled Litigation | University House Communities Group, Inc
Loss Contingencies [Line Items]
Litigation settlement, amount awarded to other party	$ 30,000

X

- Definition

Amount of difference between the carrying amount and the sales price of real estate properties sold as part of discontinued operations.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_LitigationCaseAxis=ivtp_UniversityHouseCommunitiesGroupIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: