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Restructuring, Impairment and Other Charges - Narrative (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Facility
Jun. 30, 2016
USD ($)
Facility
Jun. 30, 2017
USD ($)
Facility
Jun. 30, 2016
USD ($)
Facility
Restructuring Cost And Reserve [Line Items]        
Employee termination costs $ 2.4 $ 6.1 $ 8.8 $ 11.0
Number of facilities closed | Facility   2   2
Impairment charges (0.3) $ 0.7 0.2 $ (0.9)
Other restructuring charges $ 1.1 $ 0.8 $ 2.7 $ 2.3
Strategic Services        
Restructuring Cost And Reserve [Line Items]        
Number of facilities closed | Facility 1   1  
Impairment charges $ (0.3)   $ 0.2