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Basis of Presentation and Significant Accounting Policies (Real Estate) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Real estate properties    
Buildings and improvements, net $ 1,360,923tier_InvestmentBuildingAndBuildingImprovementsNet $ 1,482,336tier_InvestmentBuildingAndBuildingImprovementsNet
Finite-Lived Intangible Assets, Net [Abstract]    
Lease intangibles, net 77,643us-gaap_FiniteLivedIntangibleAssetsNet 94,690us-gaap_FiniteLivedIntangibleAssetsNet
Intangible liabilities    
Net (14,381)us-gaap_OffMarketLeaseUnfavorable (16,984)us-gaap_OffMarketLeaseUnfavorable
Other Lease Intangibles    
Finite-Lived Intangible Assets, Net [Abstract]    
Cost 181,267us-gaap_FiniteLivedIntangibleAssetsGross
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= tier_OtherLeaseIntangiblesMember
215,913us-gaap_FiniteLivedIntangibleAssetsGross
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= tier_OtherLeaseIntangiblesMember
Less: accumulated depreciation and amortization (103,787)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= tier_OtherLeaseIntangiblesMember
(123,242)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= tier_OtherLeaseIntangiblesMember
Lease intangibles, net 77,480us-gaap_FiniteLivedIntangibleAssetsNet
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= tier_OtherLeaseIntangiblesMember
92,671us-gaap_FiniteLivedIntangibleAssetsNet
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= tier_OtherLeaseIntangiblesMember
Acquired Above-Market Leases    
Finite-Lived Intangible Assets, Net [Abstract]    
Cost 4,074us-gaap_FiniteLivedIntangibleAssetsGross
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
11,785us-gaap_FiniteLivedIntangibleAssetsGross
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
Less: accumulated depreciation and amortization (3,911)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
(9,766)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
Lease intangibles, net 163us-gaap_FiniteLivedIntangibleAssetsNet
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
2,019us-gaap_FiniteLivedIntangibleAssetsNet
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
Leases, Acquired-in-Place, Market Adjustment [Member]    
Intangible liabilities    
Cost (56,404)tier_FiniteLivedIntangibleLiabilitiesGross
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember
(59,605)tier_FiniteLivedIntangibleLiabilitiesGross
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember
Less: accumulated depreciation and amortization 42,023tier_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember
42,621tier_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember
Net (14,381)us-gaap_OffMarketLeaseUnfavorable
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember
(16,984)us-gaap_OffMarketLeaseUnfavorable
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember
Leases, Acquired-in-Place Amortization    
Anticipated amortization associated with the acquired lease intangibles for each of the following five years    
April - December 2015 2,375tier_FiniteLivedIntangibleAssetsAndLiabilitiesAmortizationExpenseRemainderOfFiscalYear
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= tier_LeasesAcquiredInPlaceAmortizationMember
 
2016 1,185tier_FiniteLivedIntangibleAssetsAndLiabilitiesAmortizationExpenseYearTwo
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= tier_LeasesAcquiredInPlaceAmortizationMember
 
2017 579tier_FiniteLivedIntangibleAssetsAndLiabilitiesAmortizationExpenseYearThree
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= tier_LeasesAcquiredInPlaceAmortizationMember
 
2018 (145)tier_FiniteLivedIntangibleAssetsAndLiabilitiesAmortizationExpenseYearFour
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= tier_LeasesAcquiredInPlaceAmortizationMember
 
2019 475tier_FiniteLivedIntangibleAssetsAndLiabilitiesAmortizationExpenseYearFive
/ tier_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis
= tier_LeasesAcquiredInPlaceAmortizationMember
 
Building and Building Improvements [Member]    
Real estate properties    
Cost 1,895,389us-gaap_BuildingsAndImprovementsGross
/ tier_BuildingsAndBuildingImprovementsAxis
= us-gaap_BuildingAndBuildingImprovementsMember
2,039,765us-gaap_BuildingsAndImprovementsGross
/ tier_BuildingsAndBuildingImprovementsAxis
= us-gaap_BuildingAndBuildingImprovementsMember
Less: accumulated depreciation and amortization (534,466)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
/ tier_BuildingsAndBuildingImprovementsAxis
= us-gaap_BuildingAndBuildingImprovementsMember
(557,429)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
/ tier_BuildingsAndBuildingImprovementsAxis
= us-gaap_BuildingAndBuildingImprovementsMember
Buildings and improvements, net $ 1,360,923tier_InvestmentBuildingAndBuildingImprovementsNet
/ tier_BuildingsAndBuildingImprovementsAxis
= us-gaap_BuildingAndBuildingImprovementsMember
$ 1,482,336tier_InvestmentBuildingAndBuildingImprovementsNet
/ tier_BuildingsAndBuildingImprovementsAxis
= us-gaap_BuildingAndBuildingImprovementsMember