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Commitments and Contingent Liabilities (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Jul. 26, 2016
Mar. 31, 2015
Mar. 31, 2017
Commitments and Contingent Liabilities      
Lease period, minimum     5 years
Lease period, maximum     20 years
Loss Contingencies      
Letters of credit outstanding     $ 28,700
Surety bonds posted     16,400
Holdings | Holdings Bond      
Loss Contingencies      
Senior unsecured notes issued     $ 700,000
Senior subordinated convertible notes, interest rate (as a percent)     3.80%
Percentage of interest and principal due to the co-obligor as a result of the change in ownership and subsequent relief of debt obligation   50.10%  
Percentage of expenses relating to the debt obligation due to the co-obligor as a result of the change in ownership and subsequent relief of debt obligation   100.00%  
PTL      
Loss Contingencies      
Ownership interest in Penske Truck Leasing Co (as a percent) 9.00%   23.40%
GEC | PTL      
Loss Contingencies      
Ownership interest in Penske Truck Leasing Co (as a percent)     15.50%
Mitsui and Co      
Loss Contingencies      
Purchase of ownership interest   20.00%  
Mitsui and Co | PTL      
Loss Contingencies      
Ownership interest in Penske Truck Leasing Co (as a percent)     20.00%
Penske Corporation | PTL      
Loss Contingencies      
Ownership interest in Penske Truck Leasing Co (as a percent)     41.10%
Guarantee of Indebtedness of Others | GEC      
Loss Contingencies      
Percentage of interest agreed to indemnify if GEC required to make any payments of principal or interest     9.00%
Annual fee pay for acting as co-obligor     $ 950
Value of principal repayment included in maximum amount of Company's potential obligations     $ 63,100