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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)
 7 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
May 31, 2016
May 31, 2015
Dec. 31, 2015
Goodwill [Line Items]          
Accumulated impairment loss $ 0 $ 0 $ 0   $ 0
Amortization expense of acquired intangibles $ 194,329,000 $ 337,878,000 $ 113,689,000 $ 72,587,000  
Customer-related intangible assets          
Goodwill [Line Items]          
Intangible assets weighted average amortization periods 12 years 1 month 16 years 9 months 18 days 13 years 10 months 24 days 15 years 1 month 6 days  
Trade name          
Goodwill [Line Items]          
Intangible assets weighted average amortization periods   15 years      
Acquired technology          
Goodwill [Line Items]          
Intangible assets weighted average amortization periods   8 years 9 months 18 days 5 years 9 years 1 month 6 days  
Contract-based intangible assets          
Goodwill [Line Items]          
Intangible assets weighted average amortization periods   3 years      
Trademarks and trade names          
Goodwill [Line Items]          
Intangible assets weighted average amortization periods     7 years 6 years 1 month 6 days