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Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	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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