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SEGMENT INFORMATION - Narrative (Details) - Sales Revenue, Net - Geographic Concentration Risk | 7 Months Ended | 12 Months Ended
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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%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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