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SEGMENT INFORMATION - Narrative (Details) - Sales Revenue, Net - Geographic Concentration Risk
7 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
May 31, 2016
May 31, 2015
United States        
Segment Reporting Information [Line Items]        
Percentage of total consolidated revenues from external customers 67.00% 66.00% 61.00% 60.00%
United Kingdom        
Segment Reporting Information [Line Items]        
Percentage of total consolidated revenues from external customers 10.00% 11.00% 10.00% 13.00%
Canada        
Segment Reporting Information [Line Items]        
Percentage of total consolidated revenues from external customers     10.00% 11.00%