Income Taxes - Expected Income Tax Expense /(Benefit) using Federal Statutory Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule Of Expected Income Tax Expense [Line Items]
Federal statutory rate-35%	$ (929)	$ (5,053)	$ 3,663
Pass thru impact	352	1,689	(1,267)
Goodwill impairment			1,299
Deferred tax valuation allowance	(42)	1,964	(5,214)
Other, net	4	251	770
Total	$ (615)	$ (1,149)	$ (749)

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

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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- Definition

The component of income tax expense representing amounts paid or payable (or refundable) which are classified as "income taxes" as determined by applying the provisions of enacted tax law to other than the taxable Income or Loss from continuing operations for the period. Items affecting income taxes and required to be disclosed, but not included elsewhere, would also be designated as "Other".

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