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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Taxes Disclosure [Line Items] |  |  |
Federal statutory rate | 35.00% | 35.00% | 35.00%
Annual effective income tax rate, percentage | 26.00% | (3.00%) | 1.00%
Net deferred tax asset | $ 64,132,000 | $ 66,272,000 |
Alternative minimum tax credit carryforward | 13,026,000 | 15,247,000 |
Deferred tax asset for other-than-temporary impairment of securities | 15,233,000 | 15,764,000 |
Capital losses | 300,000 |  |
Future taxable income | $ 170,600,000 |  |

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