GOODWILL AND OTHER INTANGIBLE ASSETS - Amortization Over Remaining Life (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Estimated amortization expense
Remaining 2021	$ 6,055
2022	24,220
2023	21,571
2024	12,940
2025	11,507
Thereafter	11,132
Finite-lived intangible assets, net	87,425	$ 105,310
NAST
Estimated amortization expense
Remaining 2021	2,024
2022	8,096
2023	8,096
2024	7,991
2025	7,857
Thereafter	9,168
Global Forwarding
Estimated amortization expense
Remaining 2021	3,738
2022	14,953
2023	12,304
2024	3,778
2025	2,479
Thereafter	403
All Other and Corporate
Estimated amortization expense
Remaining 2021	293
2022	1,171
2023	1,171
2024	1,171
2025	1,171
Thereafter	$ 1,561

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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