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Income Taxes - Summary of Effective Tax Rate for Continuing Operations Differed from U.S. Statutory Federal Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Statutory federal tax rate	35.00%	35.00%	34.00%
State taxes, net of federal benefit	3.40%	0.40%	(4.20%)
Valuation allowance on capital loss carryforward and state tax credit carryforward	(0.40%)	2.30%	3.10%
Adjustment for final positions on filed returns	(1.50%)	(0.30%)	(0.30%)
Officer life insurance proceeds	0.00%	0.00%	(22.40%)
Nondeductible expenses and other, net	0.80%	4.40%	3.90%
Federal tax-exempt interest income	(0.20%)	(0.40%)	(0.90%)
Federal and state tax credits	(8.90%)	(8.90%)	(7.70%)
Total	28.20%	32.50%	5.50%

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Effective income tax rate reconciliation non deductible expenses and other net.

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Effective income tax rate reconciliation state taxes net of federal benefit.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to life insurance expense.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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