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Commitments and Contingent Liabilities (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 | Dec. 31, 2012
Commitments and Contingent Liabilities |  |
Lease period, minimum | 5 years |
Lease period, maximum | 20 years |
Loss Contingencies |  |
Letters of credit outstanding | 18,997 |
Surety bonds posted | 8,270 |
Holdings | Holdings Bond |  |
Loss Contingencies |  |
Senior unsecured notes issued |  | 700,000
Senior subordinated convertible notes, interest rate |  | 3.80%
Penske Truck Leasing Co., L.P. |  |
Loss Contingencies |  |
Limited partnership interest in Penske Truck Leasing Co (as a percent) | 9.00% |
Funds Used to Reduce Outstanding Debt |  | 700,000
Penske Truck Leasing Co., L.P. | Holdings |  |
Loss Contingencies |  |
Subsidiary Contributed Capital |  | 700,000
Subsidiary of limited liability company or limited partnership ownership interest given in exchange of amount received percentage |  | 21.50%
Guarantee of Indebtedness of Others | GECC |  |
Loss Contingencies |  |
Annual fee pay for acting as co-obligor | 950 |
Percentage of interest agreed to indemnify if GECC required to make any payments of principal or interest | 9.00% |
Value of interest payments included in maximum amount of Company's potential obligations | 63,100 |

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- Definition Represents the percentage which the reporting entity has agreed to indemnify a third party for payments the third party is required to pay as co-obligor of debt. + References No definition available. + Details
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- Definition Subsidiary contributed capital from the offering of the Holdings Bonds and a portion of its cash on hand. + References No definition available. + Details
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- Definition Increase of additional borrowings on existing and new debt instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 + Details
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