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OTHER INFORMATION (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Other Income and Expenses [Abstract]        
Change in deferred income tax liabilities $ 0 $ 0 $ 0 $ 0
Gain on sale of cost method investment $ 9,900,000