v3.8.0.1

Summary of Significant Accounting Policies - TPG Investment in Company (Details) - TPG Management - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 19, 2013 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
TPG Investment in Company |  |  |  |
Ownership percentage (percent) |  | 43.70% |  |
Management Services Agreement |  |  |  |
TPG Investment in Company |  |  |  |
Monitoring fee (up to) | $ 0.5 |  |  |
TPG ownership percentage (at least) | 30.00% |  |  |
Payments for Fees |  | $ 0.4 | $ 0.4 | $ 0.4

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