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Income Taxes - Significant Portions of Deferred Tax Liabilities and Deferred Tax Assets (Detail) - Successor [Member] - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Deferred Tax Assets, Tax Credit Carryforwards | $ 29,577 | $ 0
Deferred tax liabilities: |  |
Insurance intangible | 165,104 | 177,864
Deferred Tax Liabilities, Debentures | 0 | 28,387
Variable interest entities | 20,819 | 22,817
Investments | 34,920 | 28,798
Unearned premiums and credit fees | 50,733 | 51,485
Other | 10,248 | 9,402
Deferred Tax Liabilities, Gross, Noncurrent | 281,824 | 318,753
Deferred tax assets: |  |
Net operating loss and capital carryforward | 724,893 | 775,917
Loss reserves | 253,282 | 264,624
Other | 1,819 | 2,140
Sub total deferred tax assets | 1,017,302 | 1,048,266
Valuation allowance | 768,259 | 763,172
Total deferred tax assets | 249,043 | 285,094
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation | 7,731 | 5,585
Deferred Tax Assets, Net | $ (32,781) | $ (33,659)

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