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Introduction and Basis Of Presentation (Detail)
9 Months Ended
Sep. 30, 2015
Segment
Vehicle
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Number of revenue equipment units in fleet 20,836
Number of tractors company driver tractors 15,824
Number of owner-operator tractors 5,012
Number of trailers 64,528
Number of intermodal containers 9,150
Number of reportable operating segments | Segment 4