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Income Taxes - Significant Portions of Deferred Tax Liabilities and Deferred Tax Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Deferred tax liabilities:    
Variable interest entities $ 22,015 $ 28,773
Deferred acquisition costs 57,262 65,238
Unearned premiums and credit fees 54,539 41,342
Other 17,251 22,481
Total deferred tax liabilities 151,067 157,834
Deferred tax assets:    
Unrealized losses & impairments on investments 12,605 47,919
Net operating loss and capital carryforward 2,857,926 2,751,802
Loss reserves 522,502 514,150
Compensation 7,184 6,693
Other 5,687 6,672
Sub-total deferred tax assets 3,405,904 3,327,236
Valuation allowance 3,256,423 3,169,402
Total deferred tax assets 149,481 157,384
Net deferred tax liability $ (1,586)