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Summary of Company's Operating Results for Discontinued Operations (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	$ 0	$ 22,509,000	$ 32,832,000
Income/(loss) before income taxes from discontinued operations	878,000	(13,150,000)	(4,856,000)
Income tax/(benefit) provision	387,000	(5,302,000)	(1,690,000)
Income/(loss) from discontinued operations, net of tax	$ 491,000	$ (7,848,000)	$ (3,166,000)

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Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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