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Recognition of Partially Deferred Gains on Property Sales	ivtp_RecognitionofPartiallyDeferredGainsonPropertySales	0
Recognition of Partially Deferred Gains on Property Sales	ivtp_RecognitionofPartiallyDeferredGainsonPropertySales	12,756,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	1,918,478,000
Business Combination, Contingent Consideration, Liability	us-gaap_BusinessCombinationContingentConsiderationLiability	1,322,000
Business Combination, Contingent Consideration, Liability	us-gaap_BusinessCombinationContingentConsiderationLiability	1,593,000
Business Combination, Contingent Consideration, Liability	us-gaap_BusinessCombinationContingentConsiderationLiability	1,679,000
Disposition, Accounts Payable, Acquired Lease Intangibles, and Other Liabilities	ivtp_DispositionAccountsPayableAcquiredLeaseIntangiblesandOtherLiabilities	(34,125,000)
Disposition, Accounts Payable, Acquired Lease Intangibles, and Other Liabilities	ivtp_DispositionAccountsPayableAcquiredLeaseIntangiblesandOtherLiabilities	(5,047,000)
Disposition, Accounts Payable, Acquired Lease Intangibles, and Other Liabilities	ivtp_DispositionAccountsPayableAcquiredLeaseIntangiblesandOtherLiabilities	(13,035,000)
Common Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	$ 773,000
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Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	$ 5,681,912,000
Accumulated Distributions in Excess of Net Income [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	(3,765,877,000)
AOCI Attributable to Parent [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	1,670,000
Accounting Standards Update 2016-01 [Member] | Accumulated Distributions in Excess of Net Income [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	275,000	[1]
Accounting Standards Update 2016-01 [Member] | AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(275,000)	[1]
Accounting Standards Update 2017-05 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	12,756,000	[1]
Accounting Standards Update 2017-05 [Member] | Accumulated Distributions in Excess of Net Income [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 12,756,000	[1]
[1] See Note 2. Basis of Presentation and Summary of Significant Accounting Policies.

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Amount of liability recognized arising from contingent consideration in a business combination.

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