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Commitments And Contingencies (Asbestos Liability) (Detail) (USD $)	3 Months Ended			3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Mar. 31, 2013 Asbestos Commitments and Contingencies LegalMatter Insurer_Group	Mar. 31, 2012 Asbestos Commitments and Contingencies	Dec. 31, 2012 Asbestos Commitments and Contingencies	Dec. 31, 2011 Asbestos Commitments and Contingencies	Dec. 31, 2010 Asbestos Commitments and Contingencies	Mar. 09, 2012 Frank Paasch Asbestos Commitments and Contingencies	Jul. 14, 2008 Joseph Norris Asbestos Commitments and Contingencies Year	Jun. 30, 2009 Earl Haupt Asbestos Commitments and Contingencies	Mar. 14, 2008 James Baccus Asbestos Commitments and Contingencies	May 16, 2008 Chief Brewer Asbestos Commitments and Contingencies	Feb. 23, 2011 James Nelson Asbestos Commitments and Contingencies	Mar. 23, 2010 James Nelson Asbestos Commitments and Contingencies	Feb. 23, 2011 Larry Bell Asbestos Commitments and Contingencies	Mar. 23, 2010 Larry Bell Asbestos Commitments and Contingencies	Aug. 21, 2012 Ronald Dummitt Asbestos Commitments and Contingencies	Aug. 17, 2011 Ronald Dummitt Asbestos Commitments and Contingencies	Feb. 25, 2013 Frank Paasch Asbestos Commitments and Contingencies	Feb. 02, 2009 Dennis Woodard Asbestos Commitments and Contingencies	Aug. 29, 2012 William Paulus Asbestos Commitments and Contingencies	Feb. 25, 2013 Frank Vincinguerra Asbestos Commitments and Contingencies	Oct. 23, 2012 Gerald Suttner Asbestos Commitments and Contingencies	Nov. 28, 2012 James Hellam Asbestos Commitments and Contingencies	Mar. 01, 2013 Ivo Peraica Asbestos Commitments and Contingencies	Mar. 31, 2013 New York Asbestos Commitments and Contingencies	Mar. 31, 2013 Mississippi Asbestos Commitments and Contingencies	Mar. 31, 2013 Texas Asbestos Commitments and Contingencies	Mar. 31, 2013 Ohio Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Plaintiff's Request																		$ 4,900,000						$ 3,000,000		$ 19,300,000
Court written decision																		8,000,000
Pending claims				56,208	57,398	56,442	58,658																				19,200	5,500	9,900	4,600
Number of judgments paid				2
Number of years after judgment paid, years										2
Jury verdict payment including accrued judgment interest										2,540,000
Jury verdict payment											20,000
Compensatory damages												2,450,000
Additional damages												11,900,000
Court judgment													680,000			200,000					1,650,000	800,000		100,000	1,282,000
Jury verdict percentage of responsibility.																			99.00%		0.50%
Jury verdict									123,000						14,500,000		3,500,000		32,000,000	2,500,000	16,930,000		2,300,000
Jury Verdict Total																				250,000			460,000			35,000,000
Share Of Responsibility Of Verdict									12.50%						9.09%		5.00%			10.00%		10.00%	20.00%	4.00%	7.00%
Court judgment against all parties held responsible														4,000,000
Additional interest on the compensation awarded														10,000
Payments for asbestos-related fees and costs, net of insurance recoveries	10,493,000	18,235,000		10,500,000	18,200,000	78,000,000
Cumulative claims resolved				91,000
Settlement cost				375,000,000
Average settlement cost per resolved claim						6,300	4,123	7,036
Cumulative average settlement cost per resolved claim				4,100
Number of years included in methodology base reference period				2
Additional quarters included in methodology base reference period				3
Estimated payments to current and future claimants				36,000,000,000
Additional liability							285,000,000
Percentage of mesothelioma claims of total pending asbestos claims							8.00%
Percentage of mesothelioma claims of aggregate settlement and defense costs							90.00%
Liability for claims				773,000,000			894,000,000
Percentage Of Asbestos Liability Attributable To Settlement And Denfese Costs For Future Claims							80.00%
Current portion of total estimated liability	91,670,000		91,670,000	92,000,000
Number of coverage in place agreements with excess insurer groups				11
Number of buyout agreements with excess insurer groups				9
Aggregate value of policy buyout agreements				82,100,000
Forecasted percentage of liability that would be reimbursed by insurers							25.00%
Insurance reimbursement asset				193,000,000			225,000,000
Jury Verdict Non-Economic Damages																						6,500,000			4,500,000
Jury Verdict Economic Damages																						400,000			900,000
Gross Settlement And Defense Incurred Costs				$ 20,500,000	$ 23,600,000	$ 96,100,000

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Court written decision confirming jury’s liability findings but reducing awarded damages.

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The estimated amount of funds available from post bankruptcy trusts to pay current and future asbestos claimants.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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