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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Thousands
 3 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Country
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2018
USD ($)
Country
Dec. 31, 2018
USD ($)
Country
Dec. 31, 2018
USD ($)
segment
Country
Dec. 31, 2018
USD ($)
Country
shares
Dec. 31, 2018
USD ($)
Country
reporting_units
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
May 31, 2016
USD ($)
shares
Jan. 01, 2019
USD ($)
Jan. 01, 2018
USD ($)
Product Information [Line Items]                                        
Number of countries in which entity operates | Country 32                   32 32 32 32 32          
Number of reportable segments                         3   3          
Amortization period of capitalized contract costs 7 years                   7 years 7 years 7 years 7 years 7 years          
Number of reporting units | segment                         7              
Buyout of relationship managers and sales managers commissions, fixed multiple period                     12 months                  
Antidilutive securities excluded from computation of earnings per share (shares) | shares                 0         0   0   0    
Prepaid expenses and other current assets $ 216,708       $ 206,545           $ 216,708 $ 216,708 $ 216,708 $ 216,708 $ 216,708 $ 206,545        
Increase (decrease) in prepaid expenses and other assets                 $ 44,164     160,800       129,427   $ 64,216    
Retained earnings 2,066,415       1,597,897           2,066,415 2,066,415 2,066,415 2,066,415 2,066,415 1,597,897        
Other noncurrent assets 362,923       207,297           $ 362,923 362,923 $ 362,923 $ 362,923 $ 362,923 207,297        
Revenues $ 880,555 $ 857,670 $ 833,164 $ 794,977 $ 1,054,253 $ 1,038,907 $ 962,240 $ 919,762 2,202,896 $ 1,730,070   3,366,366       3,975,163 $ 3,370,976 2,898,150    
Cost of service                 1,094,593 638,700   1,095,014       1,928,037 1,603,532 1,147,639    
Selling, general and administrative expenses                 870,352 $ 784,823   1,534,297       1,488,258 $ 1,411,096 1,325,567    
Accounting Standards Update 2016-02 | Forecast                                        
Product Information [Line Items]                                        
Lease liability recognized                                     $ 275,000  
Right-of-use assets                                     $ 235,000  
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09                                        
Product Information [Line Items]                                        
Retained earnings                                       $ 51,000
Other noncurrent assets                                       64,600
Deferred income tax liabilities                                       $ 15,600
Revenues                       1,110,800                
Cost of service                       1,042,900                
Selling, general and administrative expenses                       $ 67,900                
Restatement Adjustment                                        
Product Information [Line Items]                                        
Increase (decrease) in prepaid expenses and other assets                 $ 58,200             $ 82,900   $ 12,000    
Minimum | Software                                        
Product Information [Line Items]                                        
Range of useful lives in years                     2 years         2 years        
Maximum | Software                                        
Product Information [Line Items]                                        
Range of useful lives in years                     10 years         10 years