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Interim Financial Statements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012 item	Sep. 30, 2011	Sep. 30, 2012 item	Sep. 30, 2011 item
Interim Financial Statements
Number of owned and operated franchises in US	169		169
Number of owned and operated franchises outside US	173		173
Total number of owned and operated franchises	342		342
Number of awarded franchises			7
Number of brands represented by franchises awarded			7
Number of disposed franchises			7
Number of brands represented by franchises disposed			7
Business Acquisition
Number of acquired franchises			21	3
Combined financial information regarding entities accounted for as discontinued operations
Revenues	$ 42,002	$ 114,129	$ 141,031	$ 388,871
Pre-tax income (loss)	(393)	(1,411)	(12,581)	(6,207)
Gain on disposal	$ 285	$ 250	$ 10,445	$ 2,016
Penske Truck Leasing Co., L.P.
Interim Financial Statements
Limited partnership interest in Penske Truck Leasing Co (as a percent)			9.00%
Agnew Group
Business Acquisition
Number of acquired franchises			14
Number of other acquired franchises			7

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Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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