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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Assets measured at fair value      
Real Estate Investment Property, Net $ 1,609,953us-gaap_RealEstateInvestmentPropertyNet $ 1,768,766us-gaap_RealEstateInvestmentPropertyNet  
Asset Impairment Charges Including Discontinued Operations (132)tier_AssetImpairmentChargesIncludingDiscontinuedOperations (4,940)tier_AssetImpairmentChargesIncludingDiscontinuedOperations (8,225)tier_AssetImpairmentChargesIncludingDiscontinuedOperations
Assets associated with real estate held for sale 255,130us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation 137,640us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation  
Asset impairment losses 0tier_DisposalGroupIncludingDiscontinuedOperationAssetImpairmentLosses   (8,225)tier_DisposalGroupIncludingDiscontinuedOperationAssetImpairmentLosses
Fair Value, Measurements, Nonrecurring [Member] | Level 1      
Assets measured at fair value      
Real Estate Investment Property, Net 0us-gaap_RealEstateInvestmentPropertyNet
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0us-gaap_RealEstateInvestmentPropertyNet
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Assets associated with real estate held for sale   0us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
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Fair Value, Measurements, Nonrecurring [Member] | Level 2      
Assets measured at fair value      
Real Estate Investment Property, Net 11,489us-gaap_RealEstateInvestmentPropertyNet
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= us-gaap_FairValueInputsLevel2Member
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11,489us-gaap_RealEstateInvestmentPropertyNet
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= us-gaap_FairValueInputsLevel2Member
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Assets associated with real estate held for sale   0us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
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Fair Value, Measurements, Nonrecurring [Member] | Level 3      
Assets measured at fair value      
Real Estate Investment Property, Net 0us-gaap_RealEstateInvestmentPropertyNet
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= us-gaap_FairValueInputsLevel3Member
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0us-gaap_RealEstateInvestmentPropertyNet
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= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
 
Fair Value, Measurements, Nonrecurring [Member] | Real Estate [Member] | Level 3      
Assets measured at fair value      
Assets, Fair Value Disclosure   42,000us-gaap_AssetsFairValueDisclosure
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Carrying Amount | Level 2      
Assets measured at fair value      
Notes Payable, Fair Value Disclosure 1,124,475us-gaap_NotesPayableFairValueDisclosure
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1,194,085us-gaap_NotesPayableFairValueDisclosure
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Notes Payable held for sale, Fair Value Disclosure 96,824tier_NotesPayableheldforsaleFairValueDisclosure
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97,257tier_NotesPayableheldforsaleFairValueDisclosure
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Total Fair Value | Level 2      
Assets measured at fair value      
Notes Payable, Fair Value Disclosure 1,147,309us-gaap_NotesPayableFairValueDisclosure
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1,216,991us-gaap_NotesPayableFairValueDisclosure
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Notes Payable held for sale, Fair Value Disclosure 95,175tier_NotesPayableheldforsaleFairValueDisclosure
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95,011tier_NotesPayableheldforsaleFairValueDisclosure
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Total Fair Value | Fair Value, Measurements, Nonrecurring [Member]      
Assets measured at fair value      
Real Estate Investment Property, Net 11,489us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_FairValueByMeasurementBasisAxis
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11,489us-gaap_RealEstateInvestmentPropertyNet
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Assets associated with real estate held for sale   $ 42,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
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