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Commitments And Contingencies (Other Contingencies) (Detail) |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 08, 2014 USD ($) | Sep. 30, 2014 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2008 USD ($) | Dec. 31, 2014 | Dec. 31, 2013 USD ($) Homeowner | Dec. 31, 2011 Homeowner Home | Sep. 30, 2015 USD ($) | Dec. 31, 2012 acre | Apr. 15, 2011 Homeowner | Dec. 31, 2007 USD ($) | Jul. 31, 2006
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Environmental Claims For A Site In Goodyear Arizona |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated liability |  |  |  | $ 65,200,000 |  |  |  | $ 67,500,000 |  |  | $ 41,500,000 |
Amount of additional remediation activities |  | 49,000,000 | $ 30,300,000 | $ 24,300,000 |  |  |  |  |  |  |  |
Accrued environmental loss contingencies current |  |  |  |  |  |  |  | 15,500,000 |  |  |  |
Loss contingency reimbursement rate |  |  |  |  |  |  |  |  |  |  |  | 21.00%
Other receivables |  |  |  |  |  |  |  | $ 14,000,000 |  |  |  |
Environmental Claims For Crab Orchard National Wildlife Refuge Superfund Site |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approximate size of referenced site, acres | acre |  |  |  |  |  |  |  |  | 55,000 |  |  |
amount paid into escrow |  |  |  |  |  | $ 166,667 |  |  |  |  |  |
Environmental Claims For Site In Roseland New Jersey |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount of additional remediation activities |  | $ 6,800,000 |  |  |  |  |  |  |  |  |  |
Approximate number of homes tested for contaminants | Home |  |  |  |  |  |  | 40 |  |  |  |  |
Number of Homes Where Contaminants Were Found | Home |  |  |  |  |  |  | 3 |  |  |  |  |
Homeowners Filing Suits Against Company | Homeowner |  |  |  |  |  | 139 |  |  |  | 3 |  |
Homes Suing Company Where Vapor Mitigation Equipment Was Installed | Homeowner |  |  |  |  |  | 3 |  |  |  |  |  |
Loss Contingency, Damages Paid, Value | $ 6,500,000 |  |  |  |  |  |  |  |  |  |  |
Number Of Tenants Who Filed Separate Lawsuit | Homeowner |  |  |  |  |  |  |  |  |  | 1 |  |
Number of members in the purported class | Homeowner |  |  |  |  |  |  | 138 |  |  |  |  |

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