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Leases (Narrative) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Leased Assets [Line Items]      
Rental expense for operating leases $ 25.2 $ 27.9 $ 27.4
Minimum      
Operating Leased Assets [Line Items]      
Operating leases renewal option period 1 year    
Maximum      
Operating Leased Assets [Line Items]      
Operating leases renewal option period 10 years