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Employee Benefit Plans - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution saving plan expense $ 12.5 $ 8.9 $ 7.8
Pension Benefits, Domestic      
Defined Benefit Plan Disclosure [Line Items]      
Expected contribution for 2015 3.0    
Postretirement Plans, Domestic      
Defined Benefit Plan Disclosure [Line Items]      
Expected contribution for 2015 1.0    
Pension Benefits, Foreign      
Defined Benefit Plan Disclosure [Line Items]      
Expected contribution for 2015 $ 3.0    
Equities      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation, minimum 25.00% 25.00%  
Target asset allocation, maximum 40.00% 40.00%  
Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation, minimum 20.00% 20.00%  
Target asset allocation, maximum 40.00% 40.00%  
Cash Alternatives Investments and Other      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation, minimum 25.00% 25.00%  
Target asset allocation, maximum 45.00% 45.00%