LONG-TERM DEBT - Schedule of Long-Term Debt (Parenthetical) (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Line of credit | Senior Credit Facility Due June Twenty Twenty Two [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity of line of credit facility	$ 1,200,000,000
Term Loan | Term Loan Facility Due Twenty Twenty Two [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity of line of credit facility	1,300,000,000
Senior Notes | Senior Notes Facility Due 2024
Debt Instrument [Line Items]
Maximum borrowing capacity of line of credit facility	$ 600,000,000
Promissory notes and deferred consideration | Notes Weighted Average Maturity Two Point Three Years And Two Point Five Years [Member]
Debt Instrument [Line Items]
Long-term debt, maturity	2 years 1 month 6 days	2 years 6 months
Foreign bank debt | 1.4 years and 1.6 years
Debt Instrument [Line Items]
Long-term debt, maturity	1 year 2 months 12 days	1 year 7 months 6 days