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Label	Element	Value
Business Combination, Contingent Consideration, Liability	us-gaap_BusinessCombinationContingentConsiderationLiability	$ 5,207,000
Business Combination, Contingent Consideration, Liability	us-gaap_BusinessCombinationContingentConsiderationLiability	732,000
Disposition, Accounts Payable, Acquired Lease Intangibles, and Other Liabilities	ivtp_DispositionAccountsPayableAcquiredLeaseIntangiblesandOtherLiabilities	(5,527,000)
Disposition, Accounts Payable, Acquired Lease Intangibles, and Other Liabilities	ivtp_DispositionAccountsPayableAcquiredLeaseIntangiblesandOtherLiabilities	(10,289,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	1,918,478,000
Recognition of Partially Deferred Gains on Property Sales	ivtp_RecognitionofPartiallyDeferredGainsonPropertySales	12,756,000
Recognition of Partially Deferred Gains on Property Sales	ivtp_RecognitionofPartiallyDeferredGainsonPropertySales	0
AOCI Attributable to Parent [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	1,670,000
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)
Common Stock [Member]
Shares, Issued	us-gaap_SharesIssued	774,293,197
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	$ 773,000
Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	5,681,912,000
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]
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)
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] See Note 6. Investments in Consolidated and Unconsolidated Entities.

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