Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Valuation Allowance [Line Items]
Valuation allowance	$ 415,453	$ 415,453
Federal statutory rate	35.00%	35.00%	35.00%
Effective income tax rate including income taxes attributable to the discontinued operations	37.50%	41.30%	36.70%
Uncertain tax positions	0us-gaap_UnrecognizedTaxBenefits	0us-gaap_UnrecognizedTaxBenefits	0us-gaap_UnrecognizedTaxBenefits
Year for audit of federal and state tax return by revenue service	2012
Accrued interest and penalties for uncertain tax positions	0	0	0
Income tax paid	3,000,000us-gaap_IncomeTaxesPaidNet	1,600,000us-gaap_IncomeTaxesPaidNet
Income tax refunds			177,500us-gaap_ProceedsFromIncomeTaxRefunds
Charitable Contributions [Member]
Valuation Allowance [Line Items]
Valuation allowance	$ 0	$ 0

Effective income tax rate including income taxes attributable to discontinued operations.

No definition available.

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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

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- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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- Definition

Tax year being audited in the income tax examination, in CCYY format.

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The amount of cash received during the period as refunds for the overpayment of taxes.

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-Name Accounting Standards Codification

-Topic 230

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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-Glossary Unrecognized Tax Benefit

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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