Benefit Plans Benefit Plans (Detail 8) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amortization of Net Prior Service Cost (Credit)	$ (6,798)
Amortization of Net Gains (Losses)	23,313
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	16,515
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amortization of Net Prior Service Cost (Credit)	0
Amortization of Net Gains (Losses)	2,374
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	2,374
Domestic Plan [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amortization of Net Prior Service Cost (Credit)	0
Amortization of Net Gains (Losses)	(691)
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	(691)
Foreign Plan [Member] | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amortization of Net Prior Service Cost (Credit)	(6,798)
Amortization of Net Gains (Losses)	21,630
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	$ 14,832