LONG-TERM DEBT - Schedule of Outstanding Letters of Credit, Unused Portion of Senior Credit Facility And Other Letters of Credit Outstanding (Detail) - Senior credit facility - Line of credit - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Outstanding letters of credit under Senior Credit Facility	$ 29.0	$ 33.0
Unused portion of the Senior Credit Facility	$ 397.0	$ 408.3