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CHANGE IN ACCOUNTING POLICIES AND ATS ACQUISITION - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Contract liability |  | $ 173,956 |  | $ 173,956 |  | $ 117,679
Other operating expenses |  | 569,070 | $ 570,111 | 1,727,842 | $ 1,769,477 |
Contract asset |  | 25,806 |  | 25,806 |  | 24,329
Goodwill |  | $ 8,012,416 |  | $ 8,012,416 |  | 8,019,861
Impact of ASC 606 | Restatement Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Contract liability |  |  |  |  |  | 6,978
Other operating expenses |  |  | (4,094) |  | (13,490) |
Contract asset |  |  |  |  |  | 24,329
Goodwill |  |  |  |  |  | 0
ATS Acquisition | Restatement Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Other operating expenses |  |  | $ 16,629 |  | $ 25,195 |
Goodwill |  |  |  |  |  | $ 23,101
Installation Services | Impact of ASC 606 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect on retained earnings, net of tax | $ 5,093 |  |  |  |  |
Cumulative effect on retained earnings, tax | 1,885 |  |  |  |  |
Commissions | Impact of ASC 606 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect on retained earnings, net of tax | 17,759 |  |  |  |  |
Cumulative effect on retained earnings, tax | $ 6,570 |  |  |  |  |

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