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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) Country | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) segment Country | Jun. 30, 2017 USD ($) | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($)
Accounting Policies [Abstract] |  |  |  |  |  |
Number of countries in which entity operates | Country | 30 |  | 30 |  |  |
Number of reportable segments | segment |  |  | 3 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Retained earnings | $ 1,819,213 |  | $ 1,819,213 |  |  | $ 1,597,897
Other noncurrent assets | 345,839 |  | 345,839 |  |  | 207,297
Deferred income tax liabilities | 443,874 |  | 443,874 |  |  | $ 436,879
Revenues | 833,164 | $ 962,240 | 1,628,141 | $ 1,882,002 |  |
Cost of service | 264,544 | 469,149 | 516,930 | 925,085 |  |
Selling, general and administrative expenses | 377,883 | $ 361,239 | 764,304 | $ 720,095 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Retained earnings |  |  |  |  | $ 51,000 |
Other noncurrent assets |  |  |  |  | 64,600 |
Deferred income tax liabilities |  |  |  |  | $ 15,600 |
Revenues | 281,900 |  | 534,300 |  |  |
Cost of service | 265,000 |  | 500,900 |  |  |
Selling, general and administrative expenses | $ 16,900 |  | $ 33,300 |  |  |

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