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Fair Value Measurements (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fair Value Disclosures [Abstract]    
Carrying value, mortgage and notes payable $ 1,840,906itpc_CarryingValueOfMortgageAndNotesPayable $ 2,999,968itpc_CarryingValueOfMortgageAndNotesPayable
Estimated fair value, mortgage and notes payable 1,864,905itpc_EstimatedFairValueOfMortgageAndNotesPayable 3,022,002itpc_EstimatedFairValueOfMortgageAndNotesPayable
Carrying Value Of Line Of Credit 37itpc_CarryingValueOfLineOfCredit 200,000itpc_CarryingValueOfLineOfCredit
Lines of Credit, Fair Value Disclosure $ 37us-gaap_LinesOfCreditFairValueDisclosure $ 200,000us-gaap_LinesOfCreditFairValueDisclosure