Summary of Significant Accounting Policies - Schedule of Expected Amortization Expense (Details) - Software Costs $ in Thousands	Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items]
2018	$ 11,529
2019	6,822
2020	3,849
2021	103
2022	50
Total amortization expense	$ 22,353

Amount of amortization expense related to property, plant and equipment with a finite life expected to be recognized during the next fiscal year following the latest fiscal year.

No definition available.

Name:	true_PropertyPlantAndEquipmentAmortizationExpenseNextTwelveMonths
Namespace Prefix:	true_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant