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Benefit Plans Benefit Plans (Detail 4) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax $ 13,195    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax (10,378) $ (47,788) $ (30,759)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax (15,153)    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax (12,056)    
Defined Benefit Plans, Amortization of Gains, Losses and Other Expenses (27,805)    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax (20,821)    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax 7,676    
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Benefit Cost, after tax 5,948    
Defined Benefit Plans, Impact of FX on Current Year Change in OCI 16,085    
Defined Benefit Plans, Impact of FX on Current Year Change in OCI, net of tax (12,092) $ 5,885 $ 5,835
Defined Benefit Plan, Changes in OCI Arising During the Period (6,002)    
Defined Benefit Plan, Changes in OCI Arising During the Period, net of tax (4,459)    
Pension Plan [Member] | Domestic Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax (1,153)    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax 0    
Defined Benefit Plans, Amortization of Gains, Losses and Other Expenses (6,556)    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax 0    
Defined Benefit Plans, Impact of FX on Current Year Change in OCI 0    
Defined Benefit Plan, Changes in OCI Arising During the Period (7,709)    
Pension Plan [Member] | Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 14,330    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax (15,153)    
Defined Benefit Plans, Amortization of Gains, Losses and Other Expenses (23,144)    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax 6,897    
Defined Benefit Plans, Impact of FX on Current Year Change in OCI 16,085    
Defined Benefit Plan, Changes in OCI Arising During the Period (985)    
Other Postretirement Benefits Plan [Member] | Domestic Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 18    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax 0    
Defined Benefit Plans, Amortization of Gains, Losses and Other Expenses 1,895    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax 779    
Defined Benefit Plans, Impact of FX on Current Year Change in OCI 0    
Defined Benefit Plan, Changes in OCI Arising During the Period $ 2,692