Quarterly report pursuant to Section 13 or 15(d)

SUBSEQUENT EVENTS SUBSEQUENT EVENTS (Details)

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SUBSEQUENT EVENTS SUBSEQUENT EVENTS (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Sep. 30, 2013
Subsequent Event [Line Items]      
Business Acquisition, Name of Acquired Entity we entered into an agreement to purchase the assets and operations of two Costa Rican-based companies: (1) Union Pak de Costa Rica, S.A., a small package delivery company, and (2) SEISA Brokerage, a customs brokerage company.    
TeamstersTentativeAgreement   we reached a tentative agreement with the Teamsters  
NumberOFContractsUnderTentativeAgreement   2  
Subsequent Event, Term of Contract   5 years  
AdditionalSupplementsOutForVote     5
RemainingSupplementsToBeSentOutForVote     11