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Income Taxes - Income (loss) before provision for tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] | Successor | Successor | Successor | Predecessor | Successor | Successor | Predecessor
Total income before provision for income taxes |  | $ 32,722 |  | $ 142,060 | $ 225,326 |  | $ 89,777
United States |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Total income before provision for income taxes |  |  |  |  | 207,700 |  |
Foreign |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Total income before provision for income taxes |  |  |  |  | $ 17,600 |  |

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