Commitments And Contingencies (Asbestos Liability) (Detail) (USD $)	9 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Asbestos Commitments and Contingencies LegalMatter Insurer_Group	Sep. 30, 2012 Asbestos Commitments and Contingencies	Sep. 30, 2013 Asbestos Commitments and Contingencies LegalMatter Insurer_Group	Sep. 30, 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	Jun. 30, 2013 Asbestos Commitments and Contingencies	Jun. 30, 2012 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	Oct. 26, 2012 Ronald Dummitt 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 Thomas Amato 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	Jul. 31, 2013 Holdsworth Asbestos Commitments and Contingencies	Sep. 11, 2013 Lee Holdsworth Asbestos Commitments and Contingencies	Sep. 17, 2013 Richard DeLisle Asbestos Commitments and Contingencies	Sep. 30, 2013 New York Asbestos Commitments and Contingencies	Sep. 30, 2013 Mississippi Asbestos Commitments and Contingencies	Sep. 30, 2013 Texas Asbestos Commitments and Contingencies	Sep. 30, 2013 Ohio Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Plaintiff's Request																															$ 19,300,000
Court written decision																							8,000,000
Pending claims				53,822	56,773	53,822	56,773	56,442	58,658		54,969	57,559																							19,100	5,300	9,700	3,000
Number of judgments paid				2		2
Number of years after judgment paid, years														2
Jury verdict payment including accrued judgment interest														2,540,000
Jury verdict payment															20,000
Additional damages																11,900,000																	11,000,000
Court judgment																	680,000			200,000		4,900,000				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	3,000,000					8,000,000
Jury Verdict Total																															35,000,000	3,100,000
Compensatory Damages																2,450,000																	11,000,000
Share Of Responsibility Of Verdict													12.50%						9.09%		5.00%				10.00%		10.00%	20.00%	4.00%	7.00%				16.00%
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	48,314,000	60,051,000		19,400,000	20,800,000	48,300,000	60,100,000	78,000,000
Cumulative claims resolved				95,000		95,000
Settlement cost				390,000,000		390,000,000
Average settlement cost per resolved claim								6,300	4,123	7,036
Cumulative average settlement cost per resolved claim				4,100		4,100
Number of years included in methodology base reference period				2		2
Additional quarters included in methodology base reference period				3		3
Estimated payments to current and future claimants				36,000,000,000		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				724,000,000		724,000,000			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		92,000,000
Number of coverage in place agreements with excess insurer groups				11		11
Number of buyout agreements with excess insurer groups				10		10
Aggregate value of policy buyout agreements				82,500,000		82,500,000
Forecasted percentage of liability that would be reimbursed by insurers									25.00%
Insurance reimbursement asset				182,000,000		182,000,000			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				$ 24,800,000	$ 23,800,000	$ 67,900,000	$ 73,500,000	$ 96,100,000