Benefit Plans Benefit Plans (Detail 1) (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, Benefit Obligation	$ 996,483	$ 1,063,722	$ 979,417
Defined Benefit Plans, Service Cost and Other	31,811	30,165
Defined Benefit Plan, Interest Cost	12,938	12,955	15,168
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(50,655)	40,033
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	966	(15,016)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	44,439	38,395
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	(17,860)	54,563
Defined Benefit Plan, Plan Assets, Amount	862,951	919,782	820,272
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(42,521)	63,924
Defined Benefit Plan, Plan Assets, Contributions by Employer	26,334	23,458
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	15,327	13,640
Defined Benefit Plan, Plan Assets, Benefits Paid	44,439	38,395
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	(11,532)	36,883
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(133,532)	(143,940)
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	864,095	918,478	838,277
Defined Benefit Plans, Service Cost and Other	30,721	29,600
Defined Benefit Plan, Interest Cost	8,630	8,511	10,664
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(40,469)	33,036
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	974	(15,153)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	36,379	30,356
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	(17,860)	54,563
Defined Benefit Plan, Plan Assets, Amount	767,410	808,215	716,169
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(34,102)	49,055
Defined Benefit Plan, Plan Assets, Contributions by Employer	26,032	22,961
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	15,176	13,503
Defined Benefit Plan, Plan Assets, Benefits Paid	36,379	30,356
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	(11,532)	36,883
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(96,685)	(110,263)
Pension Plan [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	130,202	142,571	138,155
Defined Benefit Plans, Service Cost and Other	1,090	565
Defined Benefit Plan, Interest Cost	4,242	4,374	4,428
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(10,019)	6,979
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid	7,682	7,502
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	0	0
Defined Benefit Plan, Plan Assets, Amount	95,541	111,567	104,103
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(8,419)	14,869
Defined Benefit Plan, Plan Assets, Contributions by Employer	75	97
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	7,682	7,502
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	0	0
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(34,661)	(31,004)
Other Postretirement Benefits Plan [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	2,186	2,673	2,985
Defined Benefit Plans, Service Cost and Other	0	0
Defined Benefit Plan, Interest Cost	66	70	76
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(167)	18
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	(8)	137
Defined Benefit Plan, Benefit Obligation, Benefits Paid	378	537
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	0	0
Defined Benefit Plan, Plan Assets, Amount	0	0	$ 0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	0	0
Defined Benefit Plan, Plan Assets, Contributions by Employer	227	400
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	151	137
Defined Benefit Plan, Plan Assets, Benefits Paid	378	537
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	0	0
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ (2,186)	$ (2,673)