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Operating Results for Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Revenue $ 5,512 $ 8,000 $ 11,738
Income (loss) before provision for income taxes (947) 306 759
Income tax expense (benefit) (9) 102 287
Income (loss) from discontinued operations, net of tax $ (938) $ 204 $ 472