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Commitments And Contingencies (Other Contingencies) (Detail) (USD $) |  |  | 3 Months Ended |  |  |  |  |  | 12 Months Ended |  |
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Mar. 31, 2013 | Mar. 31, 2007 | Dec. 31, 2011 Environmental Claims For A Site In Goodyear Arizona | Dec. 31, 2008 Environmental Claims For A Site In Goodyear Arizona | Mar. 31, 2013 Environmental Claims For A Site In Goodyear Arizona | Dec. 31, 2007 Environmental Claims For A Site In Goodyear Arizona | Jul. 31, 2006 Environmental Claims For A Site In Goodyear Arizona | Mar. 31, 2013 Environmental Claims For Crab Orchard National Wildlife Refuge Superfund Site acre | Mar. 31, 2013 Site 36 [Member] | Jan. 08, 2010 Merrimac Securities Class Action Lawsuit | Dec. 31, 2011 Environmental Claims For Site In Roseland New Jersey Home | Dec. 31, 2011 Environmental Claims For Site In Roseland New Jersey Homeowner | Apr. 15, 2011 Environmental Claims For Site In Roseland New Jersey Home | Jan. 11, 2013 Subsequent Event [Member]
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated liability |  |  |  | $ 65,200,000 | $ 46,300,000 | $ 41,500,000 |  |  |  |  |  |  |  |
Amount of additional remediation activities |  |  | 30,300,000 | 24,300,000 |  |  |  |  |  |  |  |  |  |
Accrued environmental loss contingencies current |  |  |  |  | 16,000,000 |  |  |  |  |  |  |  |  |
Loss contingency reimbursement rate |  |  |  |  |  |  | 21.00% |  |  |  |  |  |  |
Other receivables |  |  |  |  | 10,900,000 |  |  |  |  |  |  |  |  |
Approximate size of referenced site, acres |  |  |  |  |  |  |  | 55,000 |  |  |  |  |  |
Amount_to_resolve_all_past_and_future_claims_for_response_costs |  |  |  |  |  |  |  |  | 166,667 |  |  |  |  |
Stock price per share |  |  |  |  |  |  |  |  |  | $ 16.00 |  |  |  |
Approximate number of homes tested for contaminants |  |  |  |  |  |  |  |  |  |  | 40 | 40 |  |
Number of Homes Where Contaminants Were Found |  |  |  |  |  |  |  |  |  |  | 3 | 3 |  |
Number of tenants who filed a separate lawsuit |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Number of members in the purported class |  |  |  |  |  |  |  |  |  |  | 141 | 141 |  |
Airplane operating lease period, years |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |
Fair value of residual value guarantee | 6,200,000 | 14,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, fair value, commitment |  | 22,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Settlement Fund |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000
Contribution by Company to Settlement Fund |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 96-1 -Paragraph 161 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349 + Details
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