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Discontinued Operations - Summary of Results from Discontinued Operations (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]        
Revenue   $ 1,795   $ 3,570
(Loss) income from discontinued operations, net of income taxes $ (74) $ (192) $ (390) $ 160