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Basis of Presentation and Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
property
Dec. 31, 2014
property
Mar. 31, 2014
Schedule of Real Estate Properties and Related Lease Intangibles [Line Items]      
Number of Properties Held for Sale 4tier_NumberofPropertiesHeldforSale 3tier_NumberofPropertiesHeldforSale  
Number of Properties Subject to Ground Leases 1us-gaap_NumberOfPropertiesSubjectToGroundLeases    
Asset Impairment Charges Including Discontinued Operations $ 132tier_AssetImpairmentChargesIncludingDiscontinuedOperations $ 4,940tier_AssetImpairmentChargesIncludingDiscontinuedOperations $ 8,225tier_AssetImpairmentChargesIncludingDiscontinuedOperations
Accounts Receivable [Abstract]      
Straight-line rental revenue receivable 68,462us-gaap_DeferredRentReceivablesNet 73,266us-gaap_DeferredRentReceivablesNet  
Tenant receivables 9,379tier_TenantReceivables 10,165tier_TenantReceivables  
Non-tenant receivables 984tier_NonTenantReceivables 1,150tier_NonTenantReceivables  
Allowance for doubtful accounts (3,359)us-gaap_AllowanceForDoubtfulAccountsReceivable (1,201)us-gaap_AllowanceForDoubtfulAccountsReceivable  
Total 75,466us-gaap_AccountsReceivableNet 83,380us-gaap_AccountsReceivableNet  
Deferred Financing Fees, net [Abstract]      
Cost 23,497us-gaap_DeferredFinanceCostsGross 24,704us-gaap_DeferredFinanceCostsGross  
Less: Accumulated amortization (12,807)us-gaap_AccumulatedAmortizationDeferredFinanceCosts (13,921)us-gaap_AccumulatedAmortizationDeferredFinanceCosts  
Net 10,690us-gaap_DeferredFinanceCostsNet 10,783us-gaap_DeferredFinanceCostsNet  
Other Intangible Assets, Net [Abstract]      
Cost 2,978tier_IntangibleAssetsGrossIncludingGoodwill 2,978tier_IntangibleAssetsGrossIncludingGoodwill  
less: accumulated amortization (864)tier_IntangibleAssetsAccumulatedAmortization (834)tier_IntangibleAssetsAccumulatedAmortization  
Net 2,114us-gaap_IntangibleAssetsNetIncludingGoodwill 2,144us-gaap_IntangibleAssetsNetIncludingGoodwill  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
April - December 2015 89us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear    
2016 119us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
2017 119us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
2018 119us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
2019 $ 119us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive