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ACQUISITIONS - ACQUISITIONS (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) branches | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) branches
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | $ 78,564 | $ 89,786 |
Payments to Acquire Businesses, Gross | 50,745 | 68,502 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 26,764 | 21,284 |
Payments to Acquire Businesses, Gross | $ 51,800 | 68,502 |
Number of Stores | branches | 500 |  |
Cash Acquired from Acquisition | $ (1,055) | $ 0 |
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 |  |
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 | $ 31,600 |  |
Number of Stores | 5 |  |
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
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
Goodwill, Acquired During Period |  |  | $ 16,200
Number of Stores | branches |  |  | 9
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
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
Goodwill, Acquired During Period |  |  | $ 35,700
Number of Stores | branches |  |  | 24
Customer Relationships [Member] | Atlanta Electrical Distributors, LLC (AED) [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived Intangible Assets Acquired | $ 15,800 |  |
Customer Relationships [Member] | Hill Country Electric Supply [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 13,100
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 11 years
Customer Relationships [Member] | Needham Electric Supply Corporation [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 24,500
Noncompete Agreements [Member] | Atlanta Electrical Distributors, LLC (AED) [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived Intangible Assets Acquired | $ 100 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 5 years |  |
Noncompete Agreements [Member] | Hill Country Electric Supply [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 200
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 5 years
Trademarks [Member] | Atlanta Electrical Distributors, LLC (AED) [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived Intangible Assets Acquired | $ 6,000 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 13 years |  |
Trademarks [Member] | Hill Country Electric Supply [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 7,800
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 12 years
Trademarks [Member] | Needham Electric Supply Corporation [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 6,500
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 13 years
Minimum [Member] | Customer Relationships [Member] | Atlanta Electrical Distributors, LLC (AED) [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 13 years |  |
Minimum [Member] | Customer Relationships [Member] | Needham Electric Supply Corporation [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 12 years
Maximum [Member] | Customer Relationships [Member] | Atlanta Electrical Distributors, LLC (AED) [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 14 years |  |
Maximum [Member] | Customer Relationships [Member] | Needham Electric Supply Corporation [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 14 years

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