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Discontinued Operations and Divestitures - Loss from Discontinued Operations, Net of Tax (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Discontinued Operations And Disposal Groups [Abstract]    
Loss from discontinued operations before income tax $ (254) $ (51)
Income tax benefit (102) (21)
Loss from discontinued operations, net of tax $ (152) $ (30)