Label	Element	Value
Stockholders' Equity Attributable to Parent, Adjusted Balance	ivtp_StockholdersEquityAttributabletoParentAdjustedBalance	$ 1,918,478,000
Additional Paid-in Capital [Member]
Stockholders' Equity Attributable to Parent, Adjusted Balance	ivtp_StockholdersEquityAttributabletoParentAdjustedBalance	5,681,912,000
AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent, Adjusted Balance	ivtp_StockholdersEquityAttributabletoParentAdjustedBalance	$ 1,670,000
Common Stock [Member]
Shares, Issued	us-gaap_SharesIssued	774,293,197
Stockholders' Equity Attributable to Parent, Adjusted Balance	ivtp_StockholdersEquityAttributabletoParentAdjustedBalance	$ 773,000
Accumulated Distributions in Excess of Net Income [Member]
Stockholders' Equity Attributable to Parent, Adjusted Balance	ivtp_StockholdersEquityAttributabletoParentAdjustedBalance	(3,765,877,000)
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
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 6. Investments in Consolidated and Unconsolidated Entities.