LONG-TERM DEBT - Schedule of Long-Term Debt (Parenthetical) (Detail) - USD ($)	6 Months Ended	12 Months Ended
Jun. 30, 2021	Dec. 31, 2020
Line of credit \| $1.2 billion Senior Credit Facility, due in November 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 November 2022
Debt Instrument [Line Items]
Maximum borrowing capacity of line of credit facility	1,300,000,000
Senior Notes \| $500 million Senior Notes, due in 2029
Debt Instrument [Line Items]
Debt instrument, face amount	500,000,000
Senior Notes \| $600 million Senior Notes, due in 2024
Debt Instrument [Line Items]
Maximum borrowing capacity of line of credit facility	$ 600,000,000
Promissory notes and deferred consideration \| Promissory notes and deferred consideration
Debt Instrument [Line Items]
Long-term debt, maturity	1 year 10 months 24 days	2 years 1 month 6 days
Foreign bank debt \| Foreign bank debt
Debt Instrument [Line Items]
Long-term debt, maturity	10 months 24 days	1 year 1 month 6 days

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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