Commitments And Contingencies (Asbestos Liability) (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) LegalMatter Claim	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Aug. 21, 2015 USD ($)	Jul. 02, 2015 USD ($)	Sep. 30, 2014 USD ($)	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 ($)	Oct. 23, 2012 USD ($)	Mar. 09, 2012	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	$ 10,800,000	$ 10,700,000
Current portion of total estimated liability	$ 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	40,649	44,587	41,090	47,507
Payments for asbestos-related fees and costs, net of insurance recoveries	$ 10,800,000	$ 10,700,000	$ 49,900,000
Cumulative claims resolved | Claim	117,000
Settlement cost	$ 464,000,000
Average settlement cost per resolved claim			3,100	$ 3,800	$ 3,300
Cumulative average settlement cost per resolved claim	$ 4,000
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	532,000,000																	$ 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
Number of coverage in place agreements with excess insurer groups	11
Number of buyout agreements with excess insurer groups	10
Aggregate value of policy buyout agreements	$ 82,500,000
Forecasted percentage of liability that would be reimbursed by insurers																		25.00%
Insurance reimbursement asset	126,000,000																	$ 225,000,000
Gross Settlement And Defense Incurred Costs	$ 21,300,000	$ 18,300,000	$ 69,400,000
Frank Paasch | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Share Of Responsibility Of Verdict
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%
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	18,400
Mississippi | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | LegalMatter	5,100
Texas | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | LegalMatter	4,800
Ohio | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | LegalMatter	200