Related Party Transactions -Transactions with Stakeholders (Details) - Dealertrack - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Cost of Revenue | ||
| Related Party Transaction [Line Items] | ||
| Costs under agreement | $ 400,000 | $ 2,000,000 |
| Selling and Marketing Expense | ||
| Related Party Transaction [Line Items] | ||
| Costs under agreement | $ 0 | $ 300,000 |