Benefit Plans Benefit Plans (Detail 4) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	$ 29,799
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	(23,326)	$ (10,378)	$ (47,788)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	974
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax	780
Defined Benefit Plans, Amortization of Gains, Losses and Other Expenses	(26,075)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax	(20,173)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	7,319
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Benefit Cost, after tax	5,807
Defined Benefit Plans, Impact of FX on Current Year Change in OCI	(5,087)
Defined Benefit Plans, Impact of FX on Current Year Change in OCI, net of tax	3,522	$ (12,092)	$ 5,885
Defined Benefit Plan, Changes in OCI Arising During the Period	6,930
Defined Benefit Plan, Changes in OCI Arising During the Period, net of tax	6,218
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	5,329
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	0
Defined Benefit Plans, Amortization of Gains, Losses and Other Expenses	(5,804)
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	(475)
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	24,637
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	974
Defined Benefit Plans, Amortization of Gains, Losses and Other Expenses	(21,521)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	6,947
Defined Benefit Plans, Impact of FX on Current Year Change in OCI	(5,087)
Defined Benefit Plan, Changes in OCI Arising During the Period	5,950
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	(167)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	0
Defined Benefit Plans, Amortization of Gains, Losses and Other Expenses	1,250
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	372
Defined Benefit Plans, Impact of FX on Current Year Change in OCI	0
Defined Benefit Plan, Changes in OCI Arising During the Period	$ 1,455