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Basis of Presentation and Significant Accounting Policies - Revenue Recognition - Additional Information (Detail)
9 Months Ended
Sep. 30, 2015
Minimum  
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]  
Percentage Of Credit Losses Reimbursed To Freight Forwarding By Independently Owned Stations 70.00%
Maximum  
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]  
Percentage Of Credit Losses Reimbursed To Freight Forwarding By Independently Owned Stations 80.00%