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Contingencies - Additional Information (Details) - Pacer International $ in Millions |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 17, 2015 USD ($) | Jun. 30, 2015 USD ($) claimant | Jun. 30, 2016 claimant class_action operator | Dec. 31, 2014 claimant | Dec. 31, 2012 operator
Loss Contingencies [Line Items] |  |  |  |  |
Number of owner operators (in operators) | operator |  |  | 150 |  | 150
Number of claims heard by court (in claimants) |  | 5 | 200 | 7 |
Amount claimed | $ | $ 2.9 | $ 0.9 |  |  |
Number of class actions related to remaining claimants (in class actions) | class_action |  |  | 3 |  |
Maximum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of claims heard by court (in claimants) |  |  | 625 |  |

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