GOODWILL AND OTHER INTANGIBLE ASSETS - Change in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Balance, beginning of year	$ 1,275,816	$ 1,232,796
Acquisitions		28,591
Acquisitions and adjustments	(7)
Foreign currency translation	(16,887)	14,429
Balance, end of year	1,258,922	1,275,816
NAST
Goodwill [Roll Forward]
Balance, beginning of year	921,486	907,230
Acquisitions		3,673
Acquisitions and adjustments	(40)
Foreign currency translation	(11,038)	10,583
Balance, end of year	910,408	921,486
Global Forwarding
Goodwill [Roll Forward]
Balance, beginning of year	185,873	159,050
Acquisitions		24,918
Acquisitions and adjustments	33
Foreign currency translation	(3,877)	1,905
Balance, end of year	182,029	185,873
Robinson Fresh
Goodwill [Roll Forward]
Balance, beginning of year	141,185	139,558
Acquisitions		0
Acquisitions and adjustments	0
Foreign currency translation	(1,653)	1,627
Balance, end of year	139,532	141,185
All Other and Corporate
Goodwill [Roll Forward]
Balance, beginning of year	27,272	26,958
Acquisitions		0
Acquisitions and adjustments	0
Foreign currency translation	(319)	314
Balance, end of year	$ 26,953	$ 27,272

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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