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ACQUISITIONS - ACQUISITIONS (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($) branches	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) branches	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) branches	Dec. 31, 2016 USD ($) branches	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Number of Stores | branches	500								500
Net loss attributable to noncontrolling interest									$ (327)	$ (468)	$ (2,314)
Net sales	$ 1,996,647	$ 2,000,159	$ 1,909,624	$ 1,772,591	$ 1,793,262	$ 1,855,212	$ 1,911,582	$ 1,775,961	7,679,021	7,336,017	7,518,487
Payments to Acquire Businesses, Gross									$ 0	$ 51,922	$ 152,263
Atlanta Electrical Distributors, LLC (AED) [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition									Mar. 14, 2016
Business Acquisition, Name of Acquired Entity									Atlanta Electrical Distributors, LLC
Number of Stores	5								5
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period									$ 85,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 21,800								21,800
Goodwill, Acquired During Period									$ 30,000
Needham Electric Supply Corporation [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition										Oct. 30, 2015
Business Acquisition, Name of Acquired Entity										Needham Electric Supply Corporation ("Needham")
Number of Stores					24					24
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period										$ 115,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill					$ 31,000					31,000
Goodwill, Acquired During Period										$ 35,700
Hill Country Electric Supply [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition										May 01, 2015
Business Acquisition, Name of Acquired Entity										Hill Country Electric Supply, LP ("Hill Country")
Number of Stores | branches					9					9
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period										$ 140,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill					$ 21,100					21,100
Goodwill, Acquired During Period										16,200
Other Intangible Assets [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired										200
Trademarks
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired										14,300
Trademarks | Atlanta Electrical Distributors, LLC (AED) [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									13 years
Finite-lived Intangible Assets Acquired									$ 6,000
Customer Relationships
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired										$ 37,600
Customer Relationships | Atlanta Electrical Distributors, LLC (AED) [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired									$ 15,800
Noncompete Agreements [Member] | Atlanta Electrical Distributors, LLC (AED) [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									5 years
Finite-lived Intangible Assets Acquired									$ 100
Maximum [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									20 years
Maximum [Member] | Trademarks
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									15 years	13 years
Maximum [Member] | Customer Relationships
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									20 years	14 years
Maximum [Member] | Customer Relationships | Atlanta Electrical Distributors, LLC (AED) [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									14 years
Maximum [Member] | Noncompete Agreements [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									7 years
Minimum
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									2 years
Minimum | Trademarks
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									4 years	12 years
Minimum | Customer Relationships
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									2 years	11 years
Minimum | Customer Relationships | Atlanta Electrical Distributors, LLC (AED) [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									13 years
Minimum | Noncompete Agreements [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									2 years

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