GOODWILL AND INTANGIBLE ASSETS (Details 2) (USD $)	3 Months Ended				3 Months Ended				12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Trade name	Mar. 31, 2013 Other	Mar. 31, 2013 Customer relationships	Mar. 31, 2013 Driver network	Mar. 31, 2013 Panther Expedited Services, Inc. Minimum	Mar. 31, 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	3,304,000				2,460,000	844,000
Net Value	43,396,000				41,040,000	2,356,000
Indefinite-lived intangible assets
Net Value	35,122,000		32,300,000	2,822,000
Total intangible assets
Cost	81,822,000
Net Value	78,518,000	79,561,000
Amortization expense on intangible assets
Intangible amortization expense	1,043,000								4,000,000
Annual amortization expense on intangible assets expected for fiscal 2014-2017							$ 3,000,000	$ 4,000,000