Commitments And Contingencies (Asbestos Liability) (Detail)	3 Months Ended			12 Months Ended
	Mar. 31, 2017 USD ($) LegalMatter Claim	Dec. 31, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Oct. 06, 2016 USD ($)	Sep. 30, 2016 USD ($)	Apr. 22, 2016 USD ($)	Feb. 09, 2016 USD ($)	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 ($)	Aug. 17, 2011 USD ($)	Feb. 23, 2011 USD ($)	Mar. 23, 2010 USD ($)
Loss Contingencies [Line Items]
Payments for asbestos-related fees and costs, net of insurance recoveries	$ 14,700,000		$ 10,800,000
Current portion of total estimated liability	71,000,000	$ 71,000,000		$ 71,000,000
Airplane Operating Lease Period Years						five
Fair Value Of Residual Value Guarantee	$ 2,500,000
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	35,560	36,052	40,649	36,052	41,090	41,090
Payments for asbestos-related fees and costs, net of insurance recoveries	$ 14,700,000		$ 10,800,000	$ 56,000,000
Cumulative claims resolved | Claim	125,000
Settlement cost	$ 501,000,000
Average settlement cost per resolved claim				$ 3,900	$ 3,100	$ 3,800
Cumulative average settlement cost per resolved claim	4,000
Estimated payments to current and future claimants	36,000,000,000
Additional liability		$ 227,000,000
Percentage of mesothelioma claims of total pending asbestos claims		10.00%		10.00%
Percentage of mesothelioma claims of aggregate settlement and defense costs		90.00%		90.00%
Liability for claims	674,000,000	$ 696,000,000		$ 696,000,000
Percentage Of Asbestos Liability Attributable To Settlement And Denfese Costs For Future Claims		80.00%		80.00%
Current portion of total estimated liability	$ 71,000,000
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		21.00%		21.00%
Insurance reimbursement asset	136,000,000	$ 143,000,000		$ 143,000,000
Gross Settlement And Defense Incurred Costs	28,000,000		$ 21,300,000	$ 73,500,000
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]
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
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
PaidJuryVerdict		$ 600,000
Share Of Responsibility Of Verdict																			20.00%
Gerald Suttner | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Court Judgment																					$ 100,000
courtjudgmentwithinterest								$ 200,000
Share Of Responsibility Of Verdict																					4.00%
Plaintiff's Damages																					$ 3,000,000
James Hellam | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
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
Paid Judgment Pursuant to Appeal	5,700,000
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
Paid Judgment Pursuant to Appeal	$ 2,700,000
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
Mississippi | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | LegalMatter	4,700
Texas | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | LegalMatter	800
Ohio | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | LegalMatter	200