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Derivative Instruments and Hedging Activities (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Interest Expense [Member] | Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ 471us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
$ 0us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
 
Interest Rate Swap [Member] | Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (4,556)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
 
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Liability (5,345)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
  (789)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Swap Number One [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount 125,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= tier_SwapNumberOneMember
   
Derivative, Fixed Interest Rate 1.6775%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= tier_SwapNumberOneMember
   
Swap Number Two [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount 125,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= tier_SwapNumberTwoMember
   
Derivative, Fixed Interest Rate 1.6935%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= tier_SwapNumberTwoMember
   
Swap Number Three [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount 125,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= tier_SwapNumberThreeMember
   
Derivative, Fixed Interest Rate 1.7615%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= tier_SwapNumberThreeMember
   
Swap Number Four [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount $ 150,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= tier_SwapNumberFourMember
   
Derivative, Fixed Interest Rate 1.7695%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= tier_SwapNumberFourMember