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Benefit Plans Benefit Plans (Detail 11) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months $ 53,501    
Defined Benefit Plan, Expected Future Benefit Payment, Year Two 51,665    
Defined Benefit Plan, Expected Future Benefit Payment, Year Three 53,961    
Defined Benefit Plan, Expected Future Benefit Payment, Year Four 51,263    
Defined Benefit Plan, Expected Future Benefit Payment, Year Five 52,858    
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter $ 263,635    
Pension Plan [Member] | Domestic Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 3.49% 3.97%  
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months $ 7,972    
Defined Benefit Plan, Expected Future Benefit Payment, Year Two 8,140    
Defined Benefit Plan, Expected Future Benefit Payment, Year Three 8,344    
Defined Benefit Plan, Expected Future Benefit Payment, Year Four 8,453    
Defined Benefit Plan, Expected Future Benefit Payment, Year Five 8,641    
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter $ 43,855    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 3.97% 4.27% 4.00%
Pension Plan [Member] | Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 0.97% 0.98%  
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months $ 45,118    
Defined Benefit Plan, Expected Future Benefit Payment, Year Two 43,125    
Defined Benefit Plan, Expected Future Benefit Payment, Year Three 45,352    
Defined Benefit Plan, Expected Future Benefit Payment, Year Four 42,561    
Defined Benefit Plan, Expected Future Benefit Payment, Year Five 43,990    
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter $ 219,011    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 0.98% 1.31% 1.65%
Other Postretirement Benefits Plan [Member] | Domestic Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 2.55% 3.41%  
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months $ 411    
Defined Benefit Plan, Expected Future Benefit Payment, Year Two 400    
Defined Benefit Plan, Expected Future Benefit Payment, Year Three 265    
Defined Benefit Plan, Expected Future Benefit Payment, Year Four 249    
Defined Benefit Plan, Expected Future Benefit Payment, Year Five 227    
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter $ 769    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 3.41% 3.54% 4.00%
Healthcare Cost Trend Rate Maximum 7.00% 8.00%  
Healthcare Cost Trend Rate Minimum Percentage 7.50%    
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 5.00%