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Income Taxes - Effect of Income Taxes on Net Income and Stockholders' Equity (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Pre-tax from continuing operations [Line Items]    
Total income taxes charged to net income $ 2,849 $ 77,422
Income taxes charged (credited) to stockholders' equity:    
Unrealized gains (losses) on investment securities 18,448 58,597
Valuation Allowance to Equity (18,448) (58,597)
Other     
Total charged to stockholders' equity:     
Tax expense on income from continuing operations $ 2,849 $ 77,422