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ACQUISITIONS - ACQUISITIONS (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) branches | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |
Number of Stores | branches | 500 |  |
Net loss attributable to noncontrolling interest | $ (1,988) | $ (327) | $ (468)
Payments to Acquire Businesses, Gross |  |  | $ 51,922
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 |  |
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 |  |
Goodwill, Acquired During Period | $ 30,000 |  |
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 | 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 |  |
Maximum [Member] | Customer Relationships |  |  |
Business Acquisition [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 20 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 |  |
Minimum | Customer Relationships |  |  |
Business Acquisition [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 2 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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