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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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