Tax Receivable Agreement - Summary of Activity (Details) $ in Thousands |
6 Months Ended |
|---|---|
|
Jun. 30, 2018
USD ($)
| |
| Reconciliation Of Tax Receivable Agreement Liability [Roll Forward] | |
| Balance December 31, 2017 | $ 124,360 |
| Exchange of Class B units for Class A shares | 400 |
| Reduction of future payments due to the Buyout | (46,371) |
| Remeasurement due to change in estimated state tax rate | (1,752) |
| Payments | (7,353) |
| Balance June 30, 2018 | $ 69,284 |