Operating Results for Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	$ 262	$ 1,130	$ 3,185	$ 3,958
Loss before provision for income taxes	(74)	(71)	(123)	(123)
Income tax benefit	(28)	(18)	(46)	(28)
Loss from discontinued operations, net of tax	(46)	(53)	(77)	(95)
Gain on sale of discontinued operations	1,492		1,492
Income tax expense	563		563
Gain on sale of discontinued operations, net of tax	929		929
Discontinued operations, net of tax	$ 883	$ (53)	$ 852	$ (95)

Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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Income tax expense or benefit attributable to Income or Loss from discontinued operations during the phase-out period.

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Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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