Benefit Plans Benefit Plans (Detail 1) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Ending	$ 753,030	$ 764,164
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, Beginning	125,340	119,930
Service Cost and Other	331	264
Interest Cost	6,422	6,439	6,782
Actuarial Net (Gains) Losses	20,596	4,661
Plan Amendments	0	0
Benefits Paid	(6,197)	(5,954)
Foreign Currency Exchange Rate Changes, Benefit Obligation	0	0
Benefit Obligation, Ending	146,492	125,340	119,930
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning	97,040	86,801
Actual Return on Plan Assets	(3,004)	11,135
Contributions by Employer	65	5,058
Contributions by Plan Participants	0	0
Benefits Paid and Other Charges	(6,197)	(5,954)
Foreign Currency Exchange Rate Changes, Plan Assets	0	0
Fair Value of Plan Assets, Ending	87,904	97,040	86,801
Funded Status of Plan	(58,588)	(28,300)
Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, Beginning	661,029	600,063
Service Cost and Other	27,194	22,719
Interest Cost	24,637	22,438	21,610
Actuarial Net (Gains) Losses	33,834	4,815
Plan Amendments	(444)	(123)
Benefits Paid	(22,482)	(25,431)
Foreign Currency Exchange Rate Changes, Benefit Obligation	(6,265)	36,548
Benefit Obligation, Ending	717,503	661,029	600,063
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning	667,124	580,273
Actual Return on Plan Assets	(13,604)	29,400
Contributions by Employer	22,197	18,944
Contributions by Plan Participants	13,290	9,903
Benefits Paid and Other Charges	(23,217)	(25,431)
Foreign Currency Exchange Rate Changes, Plan Assets	(664)	54,035
Fair Value of Plan Assets, Ending	665,126	667,124	580,273
Funded Status of Plan	(52,377)	6,095
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, Beginning	14,608	14,509
Service Cost and Other	304	295
Interest Cost	731	757	1,120
Actuarial Net (Gains) Losses	(1,971)	5
Plan Amendments	558	0
Benefits Paid	(973)	(958)
Foreign Currency Exchange Rate Changes, Benefit Obligation	0	0
Benefit Obligation, Ending	13,257	14,608	14,509
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning	0	0
Actual Return on Plan Assets	0	0
Contributions by Employer	875	1,135
Contributions by Plan Participants	98	103
Benefits Paid and Other Charges	(973)	(1,238)
Foreign Currency Exchange Rate Changes, Plan Assets	0	0
Fair Value of Plan Assets, Ending	0	0	0
Funded Status of Plan	$ (13,257)	$ (14,608)