GOODWILL AND OTHER INTANGIBLE ASSETS - Amortization Over Remaining Life (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Estimated amortization expense
Remaining 2021	$ 12,397
2022	24,796
2023	22,035
2024	13,058
2025	11,582
Thereafter	11,172
Finite-lived intangible assets, net	95,040	$ 105,310
NAST
Estimated amortization expense
Remaining 2021	4,048
2022	8,096
2023	8,096
2024	7,996
2025	7,857
Thereafter	9,167
Global Forwarding
Estimated amortization expense
Remaining 2021	7,752
2022	15,505
2023	12,744
2024	3,867
2025	2,530
Thereafter	411
All Other and Corporate
Estimated amortization expense
Remaining 2021	597
2022	1,195
2023	1,195
2024	1,195
2025	1,195
Thereafter	$ 1,594

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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