PROPERTY AND EQUIPMENT Narrative (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disclosure Property And Equipment Additional Information [Abstract]
Depreciation expense charged to operations	$ 2.7	$ 2.7	$ 5.8	$ 4.4