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Discontinued Operations - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Discontinued Operations And Disposal Groups [Abstract]        
Income (loss) from discontinued operations $ (41) $ (236) $ 333 $ (319)