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Pensions - Additional Information (Detail) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]        
Payments for repurchase of common stock $ 5.6 $ 10.6 $ 6.7  
U.S. Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Benefits paid   5.5 7.3  
Estimated future employer contributions in current year   7.0    
Non-U.S. Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Benefits paid   1.2 $ 1.0  
Estimated future employer contributions in current year   1.2    
Common Stock        
Defined Benefit Plan Disclosure [Line Items]        
Payments for repurchase of common stock   $ 3.6    
Number of shares of equity securities issued by employer       0.2
Amount of employer and related party securities included in plan assets       $ 3.6