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Discontinued Operations - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Discontinued Operations [Line Items]        
Income (loss) from discontinued operations, net of taxes $ 4.5 $ (0.3) $ 4.4 $ (0.4)
Discontinued Operations [Member]        
Discontinued Operations [Line Items]        
Income (loss) from discontinued operations, net of taxes     $ 4.4 $ (0.4)