ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION (Details)	6 Months Ended
	Jun. 30, 2011
Organization and description of business
Percentage increase in compounded annual contractual wage and benefit (as a percent)	4.00%
ABF
Organization and description of business
Percentage of ABF's employees covered under collective bargaining agreement with the IBT (as a percent)	76.00%
Period of collective bargaining agreement (in years)	5