Commitments and Contingencies - Additional Information (Detail) $ in Millions			12 Months Ended
	Jul. 17, 2015 USD ($) claimant	Mar. 06, 2015 class_action claimant	Dec. 31, 2015 USD ($) operator claimant claim	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Loss Contingencies [Line Items]
Rental Expense			$ 412.1	$ 82.3	$ 6.9
Pacer International
Loss Contingencies [Line Items]
Number of owner operators | operator			150
Number of claims heard by court | claimant	7	200	7
Amount claimed	$ 2.9
Number of class actions related to remaining claimants | class_action		3
Pacer International | Maximum
Loss Contingencies [Line Items]
Number of claims heard by court | claim			600
Revenue Equipment
Loss Contingencies [Line Items]
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Other Property, Plant, and Equipment, Gross			$ 38.3
Capital leases, accumulated depreciation			5.5
Other Machinery and Equipment
Loss Contingencies [Line Items]
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Other Property, Plant, and Equipment, Gross			26.7
Capital leases, accumulated depreciation			$ 1.8