Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Amount added to valuation allowance			$ 4,300,000
Cumulative valuation allowance	93,200,000		93,200,000
Tax expense	337,000	410,000	1,076,000	1,209,000
Deferred tax liability, indefinite-lived intangible assets	8,000,000		8,000,000
Unrecognized tax benefits	70,000		70,000
Unrecognized tax benefits, which if recognized would impact on effective tax rate	50,000		50,000
Interest on income tax			$ 20,000

Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill.

+ References+ Details

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

+ References+ Details

- Definition

This element represents interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

+ References+ Details

- Definition

The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

+ References+ Details

- Definition

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

+ References+ Details