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Benefit Plans Benefit Plans (Detail 10) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Rollforward of Activity for Level 3 Asset Categories [Roll Forward]    
Fair Value of Plan Assets, Beginning $ 750,630  
Foreign Currency Exchange Rate Changes, Plan Assets (26,946) $ (9,323)
Fair Value of Plan Assets, Ending 738,167 750,630
Level 3    
Rollforward of Activity for Level 3 Asset Categories [Roll Forward]    
Fair Value of Plan Assets, Beginning 34,872 29,584
Defined Benefit Plan, Actual Return on Plan Assets Still Held 25 2,430
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period (2,857)  
Defined Benefit Plan,Purchases, Total   3,010
Defined Benefit Plan Sales, Total (21,316)  
Foreign Currency Exchange Rate Changes, Plan Assets (3,830) (152)
Fair Value of Plan Assets, Ending 6,894 34,872
Real Asset Mutual Funds, Commodities    
Rollforward of Activity for Level 3 Asset Categories [Roll Forward]    
Fair Value of Plan Assets, Beginning 58,477  
Fair Value of Plan Assets, Ending 28,558 58,477
Real Asset Mutual Funds, Commodities | Level 3    
Rollforward of Activity for Level 3 Asset Categories [Roll Forward]    
Fair Value of Plan Assets, Beginning 33,505 28,196
Defined Benefit Plan, Actual Return on Plan Assets Still Held 0 2,408
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period (2,857)  
Defined Benefit Plan,Purchases, Total   2,911
Defined Benefit Plan Sales, Total (21,278)  
Foreign Currency Exchange Rate Changes, Plan Assets (3,776) (10)
Fair Value of Plan Assets, Ending 5,594 33,505
Fixed Income Mutual Funds, Insurance Contracts    
Rollforward of Activity for Level 3 Asset Categories [Roll Forward]    
Fair Value of Plan Assets, Beginning 21,718  
Fair Value of Plan Assets, Ending 21,255 21,718
Fixed Income Mutual Funds, Insurance Contracts | Level 3    
Rollforward of Activity for Level 3 Asset Categories [Roll Forward]    
Fair Value of Plan Assets, Beginning 1,367 1,388
Defined Benefit Plan, Actual Return on Plan Assets Still Held 25 22
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period 0  
Defined Benefit Plan,Purchases, Total   99
Defined Benefit Plan Sales, Total (38)  
Foreign Currency Exchange Rate Changes, Plan Assets (54) (142)
Fair Value of Plan Assets, Ending $ 1,300 $ 1,367