DEBT - Schedule of Debt (Parenthetical) (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Jun. 14, 2019
Line of credit | $1.2 billion Senior Credit Facility, due in 2022
Debt Instrument [Line Items]
Maximum borrowing capacity of line of credit facility	$ 1,200,000,000
Term Loan | $1.3 billion Term Loan, due in 2022
Debt Instrument [Line Items]
Maximum borrowing capacity of line of credit facility	1,300,000,000
Senior Notes | $600 million Senior Notes, due 2024
Debt Instrument [Line Items]
Maximum borrowing capacity of line of credit facility	$ 600,000,000
Long-term debt, face amount			$ 600,000,000.0
Private placement notes | $125 million private placement notes, due in 2019
Debt Instrument [Line Items]
Long-term debt, face amount		$ 125,000,000
Private placement notes | $225 million private placement notes, due in 2020
Debt Instrument [Line Items]
Long-term debt, face amount		225,000,000
Private placement notes | $150 million private placement notes, due in 2021
Debt Instrument [Line Items]
Long-term debt, face amount		150,000,000
Private placement notes | $125 million private placement notes, due in 2022
Debt Instrument [Line Items]
Long-term debt, face amount		125,000,000
Private placement notes | $200 million private placement notes, due in 2022
Debt Instrument [Line Items]
Long-term debt, face amount		200,000,000
Private placement notes | $100 million private placement notes, due in 2023
Debt Instrument [Line Items]
Long-term debt, face amount		100,000,000
Private placement notes | $150 million private placement notes, due in 2023
Debt Instrument [Line Items]
Long-term debt, face amount		$ 150,000,000
Promissory notes and deferred consideration | Notes weighted average maturity 2.5 and 2.7 years
Debt Instrument [Line Items]
Long-term debt, maturity	2 years 6 months	2 years 8 months 12 days
Foreign bank debt | Debt weighted average maturity 1.5 years and 1.9 years
Debt Instrument [Line Items]
Long-term debt, maturity	1 year 6 months	1 year 10 months 24 days