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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