GOODWILL AND OTHER INTANGIBLE ASSETS - Amortization Over Remaining Life (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Estimated amortization expense
Remaining 2021	$ 18,298
2022	24,317
2023	21,522
2024	12,398
2025	10,996
Thereafter	9,838
Finite-lived intangible assets, net	97,369	$ 105,310
NAST
Estimated amortization expense
Remaining 2021	6,132
2022	8,096
2023	8,096
2024	7,944
2025	7,857
Thereafter	9,167
Global Forwarding
Estimated amortization expense
Remaining 2021	11,687
2022	15,582
2023	12,787
2024	3,815
2025	2,500
Thereafter	406
All Other and Corporate
Estimated amortization expense
Remaining 2021	479
2022	639
2023	639
2024	639
2025	639
Thereafter	$ 265

Finite Lived Intangible Assets, Amortization Expense, After Year Four

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- Definition

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year.

+ References

No definition available.

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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