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GOODWILL (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 3,107,256 |  | $ 3,107,256 |  | $ 1,759,040
Goodwill, Foreign Currency Translation Gain (Loss) |  |  | (25,582) |  |
Goodwill, Acquired During Period |  |  | 1,373,798 |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Gross | 2,388,408 |  | 2,388,408 |  | 567,717
Finite-Lived Intangible Assets, Accumulated Amortization | (292,928) |  | (292,928) |  | (280,442)
Finite-Lived Intangible Assets, Net | 2,095,480 |  | 2,095,480 |  | 287,275
Finite-Lived Intangible Asset, Expected Amortization, Year One | 53,892 |  | 53,892 |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Two | 99,853 |  | 99,853 |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Three | 96,049 |  | 96,049 |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Four | 94,739 |  | 94,739 |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Five | 91,352 |  | 91,352 |  |
Finite-Lived Intangible Asset, Expected Amortization, after Year Five | 828,099 |  | 828,099 |  |
Amortization of Intangible Assets | 10,100 | $ 8,500 | 18,600 | $ 17,100 |
Finite-Lived Intangible Asset, Expected Amortization, Year Three | 96,049 |  | 96,049 |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Four | 94,739 |  | 94,739 |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Five | 91,352 |  | 91,352 |  |
Finite-Lived Intangible Asset, Expected Amortization, after Year Five | 828,099 |  | 828,099 |  |
Trademarks [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Gross | 24,800 |  | 24,800 |  | 24,800
Finite-Lived Intangible Assets, Accumulated Amortization | (10,350) |  | (10,350) |  | (9,319)
Finite-Lived Intangible Assets, Net | 14,450 |  | $ 14,450 |  | 15,481
Trademarks [Member] | Minimum [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 10 years |  |
Trademarks [Member] | Maximum [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 15 years |  |
Noncompete Agreements [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Gross | 4,196 |  | $ 4,196 |  | 196
Finite-Lived Intangible Assets, Accumulated Amortization | (66) |  | (66) |  | (180)
Finite-Lived Intangible Assets, Net | 4,130 |  | $ 4,130 |  | 16
Noncompete Agreements [Member] | Minimum [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 2 years |  |
Noncompete Agreements [Member] | Maximum [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 5 years |  |
Customer Relationships [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Gross | 1,442,235 |  | $ 1,442,235 |  | 358,341
Finite-Lived Intangible Assets, Accumulated Amortization | (210,147) |  | (210,147) |  | (201,962)
Finite-Lived Intangible Assets, Net | 1,232,088 |  | $ 1,232,088 |  | 156,379
Customer Relationships [Member] | Minimum [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 10 years |  |
Customer Relationships [Member] | Maximum [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 20 years |  |
Distribution Rights [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Gross | 37,371 |  | $ 37,371 |  | 37,371
Finite-Lived Intangible Assets, Accumulated Amortization | (26,266) |  | (26,266) |  | (25,294)
Finite-Lived Intangible Assets, Net | 11,105 |  | $ 11,105 |  | 12,077
Distribution Rights [Member] | Minimum [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 10 years |  |
Distribution Rights [Member] | Maximum [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 19 years |  |
Patents [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 10 years |  |
Finite-Lived Intangible Assets, Gross | 48,310 |  | $ 48,310 |  | 48,310
Finite-Lived Intangible Assets, Accumulated Amortization | (46,099) |  | (46,099) |  | (43,687)
Finite-Lived Intangible Assets, Net | 2,211 |  | 2,211 |  | 4,623
WESCO |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 1,738,346 |  | 1,738,346 |  | 1,759,040
Goodwill, Foreign Currency Translation Gain (Loss) |  |  | (26,511) |  |
Goodwill, Acquired During Period |  |  | 5,817 |  |
Anixter International |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 1,368,910 |  | 1,368,910 |  | 0
Goodwill, Foreign Currency Translation Gain (Loss) |  |  | 929 |  |
Goodwill, Acquired During Period |  |  | 1,367,981 |  |
Trademarks [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) | $ 831,496 |  | $ 831,496 |  | $ 98,699

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