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ACQUISITIONS - ACQUISITIONS (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) branches | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) branches | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2016 USD ($) branches | Dec. 31, 2015 USD ($) branches | Dec. 31, 2014 USD ($) branches
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Stores | branches | 500 |  |  |  |  |  |  |  | 500 |  |
Goodwill, Acquired During Period |  |  |  |  |  |  |  |  | $ 17,618 | $ 59,941 |
Net loss attributable to noncontrolling interest |  |  |  |  |  |  |  |  | (468) | (2,314) | $ (469)
Net sales | $ 1,793,262 | $ 1,855,212 | $ 1,911,582 | $ 1,775,961 | $ 1,861,540 | $ 1,923,899 | $ 1,916,718 | $ 1,816,330 | 7,336,017 | 7,518,487 | 7,889,626
Payments to Acquire Businesses, Gross |  |  |  |  |  |  |  |  | $ 51,922 | $ 152,263 | $ 133,825
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 |  |
LaPrairie, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Name of Acquired Entity |  |  |  |  |  |  |  |  |  |  | LaPrairie, Inc. ("LaPrairie")
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period |  |  |  |  |  |  |  |  |  |  | $ 30,000
Goodwill, Acquired During Period |  |  |  |  |  |  |  |  |  |  | $ 8,900
Hazmasters, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  |  |  |  |  |  |  | Mar. 17, 2014
Business Acquisition, Name of Acquired Entity |  |  |  |  |  |  |  |  |  |  | Hazmasters, Inc. ("Hazmasters")
Number of Stores | branches |  |  |  |  |  |  |  |  |  |  | 14
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period |  |  |  |  |  |  |  |  |  |  | $ 80,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  |  |  | 28,100
Goodwill, Acquired During Period |  |  |  |  |  |  |  |  |  |  | $ 29,500
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 |
LaPrairie [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  |  |  |  |  |  |  | Feb. 01, 2014
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  |  |  | $ 11,000
Hi-Line [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  |  |  |  |  |  |  | Jun. 11, 2014
Business Acquisition, Name of Acquired Entity |  |  |  |  |  |  |  |  |  |  | Hi-Line Utility Supply ("Hi-Line")
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period |  |  |  |  |  |  |  |  |  |  | $ 30,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  |  |  | 14,200
Goodwill, Acquired During Period |  |  |  |  |  |  |  |  |  |  | 24,000
Other Intangible Assets [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  |  |  |  |  | 200 | 300
Trademarks |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  |  |  |  |  | 14,300 | 10,900
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 | $ 38,900
Customer Relationships | Atlanta Electrical Distributors, LLC (AED) [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  |  |  |  | $ 15,800 |  |
Supplier Relationships |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  |  |  | 10 years
Finite-lived Intangible Assets Acquired |  |  |  |  |  |  |  |  |  |  | $ 3,200
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 | 10 years
Maximum [Member] | Customer Relationships |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  | 20 years | 14 years | 12 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 | 5 years
Minimum | Customer Relationships |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  | 2 years | 11 years | 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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