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Related Party Transactions (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2015
Dec. 31, 2014
Related Party Transactions      
Prepaid expenses   $ 4,585,000us-gaap_PrepaidExpenseCurrent $ 5,193,000us-gaap_PrepaidExpenseCurrent
Receivable from related party   1,925,000us-gaap_AccountsReceivableRelatedPartiesCurrent 1,865,000us-gaap_AccountsReceivableRelatedPartiesCurrent
Payable to related party   5,079,000us-gaap_AccountsPayableRelatedPartiesCurrent 4,954,000us-gaap_AccountsPayableRelatedPartiesCurrent
Dealertrack | Cost of revenue      
Related Party Transactions      
Costs under related party agreements 400,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= true_DealertrackMember		    
Marketing Firm with Related Officer      
Related Party Transactions      
Prepaid expenses   800,000us-gaap_PrepaidExpenseCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= true_MarketingFirmWithRelatedOfficerMember		 900,000us-gaap_PrepaidExpenseCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= true_MarketingFirmWithRelatedOfficerMember
Amounts due to related party   0us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= true_MarketingFirmWithRelatedOfficerMember		 200,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= true_MarketingFirmWithRelatedOfficerMember
Marketing Firm with Related Officer | Sales and marketing      
Related Party Transactions      
Costs under related party agreements 300,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= true_MarketingFirmWithRelatedOfficerMember		 1,300,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= true_MarketingFirmWithRelatedOfficerMember		  
USAA      
Related Party Transactions      
Receivable from related party   1,900,000us-gaap_AccountsReceivableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= true_USAAMember		 1,900,000us-gaap_AccountsReceivableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= true_USAAMember
Payable to related party   5,100,000us-gaap_AccountsPayableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= true_USAAMember		 4,700,000us-gaap_AccountsPayableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= true_USAAMember
USAA | Sales and marketing      
Related Party Transactions      
Costs under related party agreements $ 3,000,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= true_USAAMember		 $ 2,600,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= true_USAAMember