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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
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)