Commitments And Contingencies (Asbestos Liability) (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($) LegalMatter Insurer_Group Claim Year	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) LegalMatter Insurer_Group Claim Year	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Aug. 21, 2015 USD ($)	Jul. 02, 2015 USD ($)	Jun. 30, 2015	Jun. 30, 2014 USD ($)	Jun. 16, 2014 USD ($)	Mar. 31, 2014 USD ($)	Sep. 17, 2013 USD ($)	Sep. 11, 2013 USD ($)	Jul. 31, 2013 USD ($)	Mar. 01, 2013 USD ($)	Feb. 25, 2013 USD ($)	Nov. 28, 2012 USD ($)	Oct. 23, 2012 USD ($)	Aug. 29, 2012 USD ($)	Mar. 09, 2012 USD ($)	Dec. 31, 2011 USD ($)	Aug. 17, 2011 USD ($)	Feb. 23, 2011 USD ($)	Mar. 23, 2010 USD ($)	Jun. 30, 2009 USD ($)	Jul. 14, 2008 USD ($) Year
Loss Contingencies [Line Items]
Payments for asbestos-related fees and costs, net of insurance recoveries			$ 36,200,000	$ 46,200,000
Current portion of total estimated liability	$ 79,000,000		$ 79,000,000		$ 79,000,000
Airplane Operating Lease Period Years					five
Fair Value Of Residual Value Guarantee		$ 7,800,000		7,800,000
Fair Value Of Residual Value Guarantee, Fair Value of Operating Lease Asset Threshold		$ 9,500,000		$ 9,500,000
ResidualValueGuaranteePayment													$ 9,500,000
Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims	41,712	47,922	41,712	47,922	47,507	51,490				42,052	49,770
Number of judgments paid	3		3
Payments for asbestos-related fees and costs, net of insurance recoveries	$ 11,400,000	$ 15,400,000	$ 36,200,000	$ 46,200,000	$ 61,300,000
Cumulative claims resolved | Claim	115,000		115,000
Settlement cost	$ 446,000,000		$ 446,000,000
Average settlement cost per resolved claim					3,800	$ 3,300	$ 6,300
Cumulative average settlement cost per resolved claim	$ 3,900		$ 3,900
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	564,000,000		564,000,000																				$ 894,000,000
Percentage Of Asbestos Liability Attributable To Settlement And Denfese Costs For Future Claims																							80.00%
Current portion of total estimated liability	$ 79,000,000		$ 79,000,000
Number of coverage in place agreements with excess insurer groups	11		11
Number of buyout agreements with excess insurer groups | Insurer_Group	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	134,000,000		134,000,000																				$ 225,000,000
Gross Settlement And Defense Incurred Costs	$ 14,700,000	$ 16,500,000	$ 52,500,000	$ 61,400,000	$ 81,100,000
Frank Paasch | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Jury verdict																						$ 123,000
Share Of Responsibility Of Verdict																						12.50%
Joseph Norris | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Number of years after judgment paid, years | Year																												2
Jury verdict payment including accrued judgment interest																												$ 2,540,000
Earl Haupt | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Number of years after judgment paid, years | Year	2		2
Jury verdict payment																											$ 20,000
James Nelson | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Jury verdict																										$ 14,500,000
Share Of Responsibility Of Verdict																										9.09%
Court judgment against all parties held responsible																									$ 4,000,000
Additional interest on the compensation awarded																									10,000
Larry Bell | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Court judgment																									$ 200,000
Jury verdict																										$ 3,500,000
Share Of Responsibility Of Verdict																										5.00%
Ronald Dummitt | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Court written decision																								$ 8,000,000
Court judgment																								$ 4,900,000
Jury verdict percentage of responsibility.																								99.00%
Jury verdict																								$ 32,000,000
Frank Paasch | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Jury verdict																		$ 2,500,000
Share Of Responsibility Of Verdict																		10.00%
William Paulus | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Jury verdict payment	$ 900,000		$ 900,000								$ 900,000
Court judgment																					$ 800,000
Share Of Responsibility Of Verdict																					10.00%
Jury Verdict Non-Economic Damages																					$ 6,500,000
Jury Verdict Economic Damages																					$ 400,000
Frank Vincinguerra | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Jury verdict																		$ 2,300,000
Share Of Responsibility Of Verdict																		20.00%
Gerald Suttner | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Court judgment																				$ 100,000
Share Of Responsibility Of Verdict																				4.00%
Plaintiff's Damages																				$ 3,000,000
James Hellam | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Court judgment																			$ 1,282,000
CourtJudgmentIncludingSetoffs																			$ 1,100,000
DamagesReversedInPart								$ 20,000
Share Of Responsibility Of Verdict																			7.00%
Jury Verdict Non-Economic Damages																			$ 4,500,000
Jury Verdict Economic Damages																			$ 900,000
Ivo Peraica | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Court judgment																	$ 10,600,000
Jury Verdict Total																	35,000,000
Court_Reduced_Verdict																	$ 18,000,000
Holdsworth [Member] | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Court judgment																$ 1,700,000
Jury Verdict Total																$ 3,100,000
Lloyd Garvin [Member] | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Compensatory Damages															$ 11,000,000
Additional damages															11,000,000
CourtJudgmentIncludingSetoffs															3,500,000
Court_Reduced_Verdict															2,500,000
Court Reduced damages															$ 3,500,000
Richard DeLisle [Member] | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Court judgment														$ 1,300,000
Jury verdict														$ 8,000,000
Share Of Responsibility Of Verdict														16.00%
Ivan Sweberg [Member] | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Court judgment												$ 5,300,000
Jury Verdict Total												15,000,000
Court_Reduced_Verdict												10,000,000
Selwyn Hackshaw [Member] | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Court judgment												3,100,000
Jury Verdict Total												10,000,000
Court_Reduced_Verdict												$ 6,000,000
James Poage [Member] | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Compensatory Damages									$ 1,500,000
Additional damages									10,000,000
Court judgment									$ 10,800,000
New York | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | LegalMatter	18,500		18,500
Mississippi | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | LegalMatter	5,100		5,100
Texas | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | LegalMatter	5,700		5,700
Ohio | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | LegalMatter	200		200