Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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

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Expiration Years of Minimum Alternate Tax Credit (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Tax Credit Carryforward [Line Items]
Less: Valuation allowance	$ 2,616,000
Net deferred tax assets	33,363,000us-gaap_DeferredTaxAssetsNet	26,562,000us-gaap_DeferredTaxAssetsNet
Minimum Alternate Tax (MAT)
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	27,240,000
Less: Valuation allowance	880,000
Net deferred tax assets	26,360,000
Minimum Alternate Tax (MAT) \| 2017-18
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	210,000
Minimum Alternate Tax (MAT) \| 2018-19
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	280,000
Minimum Alternate Tax (MAT) \| 2019-20
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	1,020,000
Minimum Alternate Tax (MAT) \| 2020-21
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	3,660,000
Minimum Alternate Tax (MAT) \| 2021-22
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	830,000
Minimum Alternate Tax (MAT) \| 2022-23
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	6,250,000
Minimum Alternate Tax (MAT) \| 2023-24
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	7,410,000
Minimum Alternate Tax (MAT) \| 2024-25
Tax Credit Carryforward [Line Items]
Minimum Alternate Tax Credit	$ 7,580,000