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