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INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Parenthetical) (Detail 2)
6 Months Ended 12 Months Ended
Dec. 31, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Income Tax Disclosure [Abstract]        
U.S. federal statutory income tax rate 35.00% 21.00% 28.06% 35.00%