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Income Taxes - Significant Portions of Deferred Tax Liabilities and Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Deferred Tax Assets, Net of Valuation Allowance $ 211,811 $ 285,094
Deferred tax assets:    
Net operating loss and capital carryforward 718,978 775,917
Loss reserves 227,401 264,624
Deferred Tax Assets, Debentures 22,564 0
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation 9,500 5,585
Other 1,818 2,140
Sub total deferred tax assets 980,261 1,048,266
Valuation allowance 768,450 763,172
Insurance intangible 150,975 177,864
Deferred Tax Liabilities, Debentures 0 28,387
Variable interest entities 19,051 22,817
Investments 26,145 28,798
Unearned premiums and credit fees 48,121 51,485
Other 7,649 9,402
Deferred Tax Liabilities, Gross, Noncurrent 251,941 318,753
Deferred Tax Liabilities, Net $ 40,130 $ 33,659