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Income Taxes - Significant Portions of Deferred Tax Liabilities and Deferred Tax Assets (Detail) - Successor [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Deferred Tax Assets, Net of Valuation Allowance | $ 256,707 | $ 523,664
Deferred tax assets: |  |
Net operating loss and capital carryforward | 775,917 | 1,409,565
Loss reserves | 236,237 | 224,553
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation | 5,585 | 4,759
Deferred Tax Assets, Tax Credit Carryforwards | 0 | 31,532
Other | 2,140 | 11,967
Sub total deferred tax assets | 1,019,879 | 1,682,376
Valuation allowance | 763,172 | 1,158,712
Total deferred tax assets | (33,659) | (1,720)
Insurance intangible | 177,864 | 336,728
Variable interest entities | 22,817 | 46,343
Investments | 28,798 | 38,656
Unearned premiums and credit fees | 51,485 | 68,682
Undistributed Earnings of Foreign Subsidiaries | 0 | 30,699
Other | 9,402 | 4,276
Deferred Tax Liabilities, Gross, Noncurrent | $ 290,366 | $ 525,384

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