GOODWILL AND INTANGIBLE ASSETS (Details 2) (USD $)	6 Months Ended					6 Months Ended				12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 Trade name	Jun. 30, 2013 Other	Jun. 30, 2013 Customer relationships	Jun. 30, 2013 Driver network	Jun. 30, 2013 Panther Expedited Services, Inc. Minimum	Jun. 30, 2013 Panther Expedited Services, Inc. Maximum	Dec. 31, 2013 Panther Expedited Services, Inc. Forecast
Finite-lived intangible assets
Weighted Average Amortization Period	13 years					14 years	3 years
Cost	$ 46,700,000					$ 43,500,000	$ 3,200,000
Accumulated Amortization	4,348,000					3,237,000	1,111,000
Net Value	42,352,000					40,263,000	2,089,000
Indefinite-lived intangible assets
Net Value	35,122,000			32,300,000	2,822,000
Total intangible assets
Cost	81,822,000
Net Value	77,474,000		79,561,000
Amortization expense on intangible assets
Intangible amortization expense	2,087,000	200,000								4,000,000
Annual amortization expense on intangible assets expected for fiscal 2014-2017								$ 3,000,000	$ 4,000,000