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STOCK BASED COMPENSATION - Summary of Class B/New TMM Unit Activity (Detail) - Class B Shares/New TMM Units
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Shares/New TMM Units  
Beginning balance (in shares) | shares 883,921
Exchanges (in shares) | shares (20,487)
Ending balance (in shares) | shares 863,434
Weighted Average Grant Date Fair Value  
Beginning balance (usd per share) | $ / shares $ 5.24
Exchanges (usd per share) | $ / shares 6.93
Ending balance (usd per share) | $ / shares $ 5.20