Commitments And Contingencies (Other Contingencies) (Detail) $ in Thousands		3 Months Ended			12 Months Ended
	Aug. 08, 2014 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014	Dec. 31, 2011 Home	Apr. 22, 2016 USD ($)	Feb. 09, 2016 USD ($)	Jul. 02, 2015 USD ($)	Dec. 31, 2013 Homeowner	Dec. 31, 2012 acre	Apr. 15, 2011 Homeowner	Jul. 31, 2006
Loss Contingencies [Line Items]
Airplane operating lease period, years						five
Fair Value Of Residual Value Guarantee				$ 7,800
Fair Value Of Residual Value Guarantee, Fair Value of Operating Lease Asset Threshold				9,500
Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Gross Settlement And Defense Incurred Costs		$ 21,300	$ 18,300		$ 69,400
Environmental Claims For A Site In Goodyear Arizona
Loss Contingencies [Line Items]
Estimated liability		60,100
Amount of additional remediation activities				49,000
Accrued environmental loss contingencies current					$ 16,000
Loss contingency reimbursement rate														21.00%
Other receivables		$ 12,300
Environmental Claims For Crab Orchard National Wildlife Refuge Superfund Site
Loss Contingencies [Line Items]
Approximate size of referenced site, acres | acre												55,000
Environmental Claims For Site In Roseland New Jersey
Loss Contingencies [Line Items]
Amount of additional remediation activities				$ 6,800
Approximate number of homes tested for contaminants | Home							40
Homeowners Filing Suits Against Company | Homeowner											139		3
Loss Contingency, Damages Paid, Value	$ 6,500
Number Of Tenants Who Filed Separate Lawsuit | Homeowner													1
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]
Share Of Responsibility Of Verdict									30.00%
Jury Verdict Total									$ 1,085
George Coulbourn [Member] | Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Share Of Responsibility Of Verdict								20.00%
Jury Verdict Total								$ 9,000
Court Reduced damages								$ 5,000