Commitments And Contingencies (Schedule Of Settlement And Defense Costs) (Detail) (USD $)	3 Months Ended				12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Dec. 31, 2012
Loss Contingencies [Line Items]
Pre-tax cash payments	$ 10,493,000		$ 18,235,000
Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Settlement / indemnity costs incurred (1)	6,800,000	[1]	10,400,000	[1]	37,500,000	[1]
Defense costs incurred (1)	13,700,000	[1]	13,100,000	[1]	58,700,000	[1]
Total costs incurred	20,500,000		23,600,000		96,100,000
Settlement / indemnity payments	9,600,000		9,400,000		38,000,000
Payments For Asbestos Related Defense And Related Fees Costs	13,000,000		12,900,000		59,800,000
Insurance receipts	12,100,000		4,000,000		19,800,000
Pre-tax cash payments	$ 10,500,000		$ 18,200,000		$ 78,000,000

[1] Before insurance recoveries and tax effects.