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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Jun. 28, 2013
Jun. 29, 2012
Jun. 28, 2013
Jun. 29, 2012
Dec. 28, 2012
Jun. 28, 2013
MDT Personnel, LLC
Feb. 04, 2013
MDT Personnel, LLC
Feb. 04, 2013
MDT Personnel, LLC
Customer relationships
Feb. 04, 2013
MDT Personnel, LLC
Trade name/trademarks
Feb. 04, 2013
MDT Personnel, LLC
Non-compete agreement
Jun. 28, 2013
Crowley Transportation Services, LLC
Jun. 09, 2013
Crowley Transportation Services, LLC
Customer relationships
Jun. 09, 2013
Crowley Transportation Services, LLC
Trade name/trademarks
Intangible Assets [Line Items]                          
Acquired finite-lived intangible assets             $ 10,200,000 $ 7,800,000 $ 1,000,000 $ 1,400,000   $ 1,400,000 $ 100,000
Weighted average useful life of acquired finite-lived intangible assets           6 years 11 months 13 days   8 years 1 year 6 months 5 years      
Acquired goodwill, after adjustments 74,629,000   74,629,000   48,079,000   25,700,000 [1]            
Goodwill acquired year to date     23,400,000 [2]     22,600,000         800,000    
Goodwill adjustments     3,100,000     3,100,000              
Amortization of intangible assets $ 1,200,000 $ 800,000 $ 2,200,000 $ 1,500,000                  
[1] Goodwill is deductible for income tax purposes over 15 years as of the acquisition date.
[2] Goodwill acquired includes $22.6 million due to the MDT acquisition. We recorded goodwill adjustments of $3.1 million for the effect on goodwill of changes to net assets acquired during the measurement period relating to the MDT acquisition.Goodwill acquired also includes $0.8 million of goodwill related to our acquisition of certain assets of Crowley.