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Property and Equipment, net (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Property and Equipment, net      
Property and equipment, gross $ 78,343,000us-gaap_PropertyPlantAndEquipmentGross   $ 50,655,000us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation (22,216,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment   (19,924,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total property and equipment, net 56,127,000us-gaap_PropertyPlantAndEquipmentNet   30,731,000us-gaap_PropertyPlantAndEquipmentNet
Total depreciation and amortization expense 3,925,000true_OperatingExpensesDepreciationAmortizationAndGainLossOnDisposalOfAssets 3,114,000true_OperatingExpensesDepreciationAmortizationAndGainLossOnDisposalOfAssets  
Property and equipment capitalized but not placed in service 23,200,000true_PropertyPlantAndEquipmentGrossAssetsNotPlacedInService   8,100,000true_PropertyPlantAndEquipmentGrossAssetsNotPlacedInService
Property and Equipment      
Property and Equipment, net      
Total depreciation and amortization expense 2,900,000true_OperatingExpensesDepreciationAmortizationAndGainLossOnDisposalOfAssets
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentMember
2,000,000true_OperatingExpensesDepreciationAmortizationAndGainLossOnDisposalOfAssets
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentMember
 
Computer equipment, software, and internally developed software      
Property and Equipment, net      
Property and equipment, gross 40,507,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= true_ComputerEquipmentSoftwareAndSoftwareDevelopmentCostsMember
  37,110,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= true_ComputerEquipmentSoftwareAndSoftwareDevelopmentCostsMember
Furniture and fixtures      
Property and Equipment, net      
Property and equipment, gross 2,654,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
  2,335,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Leasehold Improvements      
Property and Equipment, net      
Property and equipment, gross 5,926,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
  4,611,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Capitalized facility leases      
Property and Equipment, net      
Property and equipment, gross 29,256,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= true_CapitalizedFacilityLeaseMember
  6,599,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= true_CapitalizedFacilityLeaseMember
Interest Costs Capitalized 700,000us-gaap_InterestCostsCapitalized
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= true_CapitalizedFacilityLeaseMember
   
Lease financing obligation 28,300,000true_LeaseFinancingObligationCurrentAndNoncurrentAmount
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= true_CapitalizedFacilityLeaseMember
  6,600,000true_LeaseFinancingObligationCurrentAndNoncurrentAmount
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= true_CapitalizedFacilityLeaseMember
Santa Monica capitalized facility lease      
Property and Equipment, net      
Property and equipment capitalized but not placed in service 22,200,000true_PropertyPlantAndEquipmentGrossAssetsNotPlacedInService
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= true_SantaMonicaCapitalizedFacilityLeaseMember
   
San Francisco capitalized facility lease      
Property and Equipment, net      
Property and equipment capitalized but not placed in service     6,600,000true_PropertyPlantAndEquipmentGrossAssetsNotPlacedInService
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= true_SanFranciscoCapitalizedFacilityLeaseMember
Internally developed software      
Property and Equipment, net      
Amortization $ 1,900,000us-gaap_AdjustmentForAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember
$ 1,100,000us-gaap_AdjustmentForAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember