Commitments And Contingencies (Asbestos Liability) (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($) LegalMatter Claim	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) LegalMatter Claim	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Oct. 06, 2016 USD ($)	Jun. 30, 2016	Apr. 22, 2016 USD ($)	Feb. 09, 2016 USD ($)	Aug. 21, 2015 USD ($)	Jul. 02, 2015 USD ($)	Jun. 30, 2015	Sep. 30, 2014 USD ($)	Jun. 16, 2014 USD ($)	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 ($)	Dec. 31, 2011 USD ($)	Aug. 17, 2011 USD ($)	Feb. 23, 2011 USD ($)	Mar. 23, 2010 USD ($)
Loss Contingencies [Line Items]
Payments for asbestos-related fees and costs, net of insurance recoveries			$ 41,500,000	$ 36,200,000
Current portion of total estimated liability	$ 75,000,000		$ 75,000,000		$ 75,000,000
Airplane Operating Lease Period Years						five
Fair Value Of Residual Value Guarantee															$ 7,800,000
Fair Value Of Residual Value Guarantee, Fair Value of Operating Lease Asset Threshold															$ 9,500,000
Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims	36,450	41,712	36,450	41,712	41,090	47,507			38,664					42,052
Payments for asbestos-related fees and costs, net of insurance recoveries	$ 15,800,000	$ 11,400,000	$ 41,500,000	$ 36,200,000	$ 49,900,000
Cumulative claims resolved | Claim	123,000		123,000
Settlement cost	$ 471,000,000		$ 471,000,000
Average settlement cost per resolved claim					3,100	$ 3,800	$ 3,300
Cumulative average settlement cost per resolved claim	$ 3,800		$ 3,800
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	487,000,000		487,000,000																					$ 894,000,000
Percentage Of Asbestos Liability Attributable To Settlement And Denfese Costs For Future Claims																								80.00%
Current portion of total estimated liability	$ 75,000,000		$ 75,000,000
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	112,000,000		112,000,000																					$ 225,000,000
Gross Settlement And Defense Incurred Costs	19,700,000	$ 14,700,000	57,500,000	$ 52,500,000	$ 69,400,000
Frank Paasch | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Jury verdict																					$ 2,500,000
Share Of Responsibility Of Verdict																					10.00%
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
courtjudgmentwithinterest	6,600,000		6,600,000
Jury verdict percentage of responsibility.																									99.00%
Jury verdict																									$ 32,000,000
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
courtjudgmentwithinterest	$ 200,000		$ 200,000
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
Reduced Damages								$ 4,250,000
CourtJudgmentIncludingSetoffs								1,940,000
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
Motion to enter judgment																			1,000,000
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
Reduced Damages								9,500,000
CourtJudgmentIncludingSetoffs								4,730,000
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
Reduced Damages								3,000,000
CourtJudgmentIncludingSetoffs								$ 0
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
Valent Rabovsky [Member] | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Court Judgment										$ 400,000
Jury Verdict Total											$ 1,085,000
Share Of Responsibility Of Verdict											30.00%
George Coulbourn [Member] | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Court Judgment										6,800,000
Jury Verdict Total										9,000,000
Court Reduced damages										$ 5,000,000
Share Of Responsibility Of Verdict										20.00%
New York | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | LegalMatter	18,300		18,300
Mississippi | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | LegalMatter	4,800		4,800
Texas | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | LegalMatter	1,500		1,500
Ohio | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | LegalMatter	200		200