Commitments And Contingencies (Asbestos Liability) (Detail)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) LegalMatter Claim	Dec. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) LegalMatter Claim	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2017	Oct. 06, 2016 USD ($)	Sep. 30, 2016 USD ($)	Apr. 22, 2016 USD ($)	Mar. 31, 2016	Feb. 09, 2016 USD ($)	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				$ 28,200,000	$ 25,700,000
Current portion of total estimated liability	$ 71,000,000	$ 71,000,000		71,000,000		$ 71,000,000
Airplane Operating Lease Period Years								five
Fair Value Of Residual Value Guarantee	$ 5,800,000			$ 5,800,000
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	31,980	36,052	38,664	31,980	38,664	36,052	41,090		35,560				40,649
Payments for asbestos-related fees and costs, net of insurance recoveries	$ 13,500,000		$ 14,900,000	$ 28,200,000	$ 25,700,000	$ 56,000,000
Cumulative claims resolved | Claim	129,000			129,000
Settlement cost	$ 509,000,000			$ 509,000,000
Average settlement cost per resolved claim						$ 3,900	$ 3,100	$ 3,800
Cumulative average settlement cost per resolved claim	4,000			4,000
Estimated payments to current and future claimants	36,000,000,000			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	653,000,000	$ 696,000,000		653,000,000		$ 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			$ 71,000,000
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		21.00%				21.00%
Insurance reimbursement asset	129,000,000	$ 143,000,000		129,000,000		$ 143,000,000
Gross Settlement And Defense Incurred Costs	16,800,000		$ 16,500,000	44,800,000	$ 37,800,000	$ 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	300,000	$ 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]
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
Paid Judgment Pursuant to Appeal				2,700,000
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				5,700,000
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%
Geoffrey_Anisansel [Member] | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Jury Verdict Total	$ 20,000,000			$ 20,000,000
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	1,500			1,500
Texas | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | LegalMatter	800			800
Ohio | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Pending claims | LegalMatter	200			200