Benefit Plans Benefit Plans (Detail 7) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 16,635	$ 16,906	$ 17,236
Defined Benefit Plan, Interest Cost	12,938	12,955	15,168
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	37,934	37,086	40,949
Amortization of Actuarial (Gains) Losses and Plan Amendments	18,756	20,129	15,962
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	0	0	7,963
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	10,395	12,904	15,380
Pension Plan [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	1,090	565	432
Defined Benefit Plan, Interest Cost	4,242	4,374	4,428
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	6,929	6,737	7,781
Amortization of Actuarial (Gains) Losses and Plan Amendments	5,804	6,556	7,606
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	0	0	7,963
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	4,207	4,758	12,648
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	15,545	16,341	16,804
Defined Benefit Plan, Interest Cost	8,630	8,511	10,664
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	31,005	30,349	33,168
Amortization of Actuarial (Gains) Losses and Plan Amendments	14,575	16,247	12,923
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	7,745	10,750	7,223
Other Postretirement Benefits Plan [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	0	0	0
Defined Benefit Plan, Interest Cost	66	70	76
Amortization of Actuarial (Gains) Losses and Plan Amendments	(1,623)	(2,674)	(4,567)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (1,557)	$ (2,604)	$ (4,491)