Commitments And Contingencies (Other Contingencies) (Detail) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Apr. 22, 2016 USD ($)	Feb. 09, 2016 USD ($)	Jul. 02, 2015 USD ($)	Dec. 31, 2012 acre	Jul. 31, 2006
Loss Contingencies [Line Items]
Airplane operating lease period, years				7
Fair Value Of Residual Value Guarantee	$ 11,100			$ 11,100
Fair Value Of Residual Value Guarantee, Fair Value of Operating Lease Asset Threshold	14,400			14,400
Payments for airplane				6,700
Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Gross Settlement And Defense Incurred Costs	30,700	$ 19,700		75,500	$ 57,500	$ 73,500
Environmental Claims For A Site In Goodyear Arizona
Loss Contingencies [Line Items]
Estimated liability	43,100			43,100
Amount of additional remediation activities			$ 49,000
Accrued environmental loss contingencies current	10,000			10,000
Loss contingency reimbursement rate											21.00%
Other receivables	$ 8,500			$ 8,500
Environmental Claims For Crab Orchard National Wildlife Refuge Superfund Site
Loss Contingencies [Line Items]
Approximate size of referenced site, acres | acre										55,000
Huttig [Domain]
Loss Contingencies [Line Items]
Litigation Settlement, Amount		$ 5,000
James Poage [Member] | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
compensatory_damages									$ 1,500
Additional damages									10,000
Court Judgment									$ 10,800
Valent Rabovsky [Member] | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Court Judgment							$ 400
Share Of Responsibility Of Verdict								30.00%
Jury Verdict Total								$ 1,085
George Coulbourn [Member] | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Court Judgment							$ 6,800
Share Of Responsibility Of Verdict							20.00%
Jury Verdict Total							$ 9,000
Court Reduced damages							$ 5,000