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Income Tax - Additional Information (Detail) (USD $)	12 Months Ended
Income Tax - Additional Information (Detail) (USD $)	Dec. 31, 2012
Income Tax Expenses [Line Items]
Unused business income tax credits	$ 6,242,000
AMT credit carryover	1,351,000
Unused business income tax expiration year	2024
State net operating loss	2,822,000
State net operating loss expiration year	2022
Recognized deferred income tax liability	14,743,000
Unrecorded deferred income tax liability	$ 5,013,000

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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- Definition

The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

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