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Summary of Significant Accounting Policies (Details 8) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenue Recognition      
Deferred revenue $ 0.5us-gaap_DeferredRevenue $ 0.4us-gaap_DeferredRevenue  
Sales and Marketing      
Marketing and advertising expenses 58.1us-gaap_MarketingAndAdvertisingExpense 27.5us-gaap_MarketingAndAdvertisingExpense 36.5us-gaap_MarketingAndAdvertisingExpense
Prepaid media costs 2.3us-gaap_PrepaidAdvertising 1.5us-gaap_PrepaidAdvertising  
Yahoo Auto Buying Program      
Sales and Marketing      
Marketing and advertising expenses     $ 20.0us-gaap_MarketingAndAdvertisingExpense
/ us-gaap_OtherCommitmentsAxis
= true_YahooAutoBuyingProgramMember