Commitments And Contingencies (Schedule Of Activity Related To Asbestos Claim) (Detail) (Asbestos Commitments and Contingencies)	3 Months Ended				9 Months Ended				12 Months Ended			9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011		Dec. 31, 2010	Sep. 30, 2012 Maritime Claims	Dec. 30, 2009 Maritime Claims
Loss Contingencies [Line Items]
Beginning claims	57,559		56,403		58,658		64,839		64,839
New claims	933		1,088		2,720		2,946		3,748
Settlements	(253)		(283)		(800)		(886)		(1,117)
Dismissals	(1,467)		(849)		(3,983)		(10,539)		(11,059)
MARDOC claims	1	[1]	2,213	[1]	178	[1]	2,212	[1]	2,247	[1]		3,378
Ending claims	56,773		58,572		56,773		58,572		58,658		64,839
Claims permanently dismissed												26,575
Remaining Claims												6,503
Total number of maritime claims													36,448
New Filings Added To Active Status, number											8

[1] As of January 1, 2010, the Company was named in 36,448 maritime actions which had been administratively dismissed by the United States District Court for the Eastern District of Pennsylvania (“MARDOC claims”), and therefore were not included in “Beginning claims”. As of September 30, 2012, pursuant to an ongoing review process initiated by the Court, 26,575 claims were permanently dismissed, and 3,378 claims remain active (and have been added to “Ending claims”). In addition, the Company was named in 8 new maritime actions in 2010 (not included in “Beginning claims”). The Company expects that more of the remaining 6,503 maritime actions will be activated, or permanently dismissed, as the Court’s review process continues.