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INTANGIBLE ASSETS - Summary of Acquired Intangible Assets (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 7,253,122 $ 7,190,428
Accumulated Amortization (4,736,420) (4,409,312)
Net Carrying Amount 2,516,702 2,781,116
Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 6,113,669 6,052,598
Accumulated Amortization (3,755,385) (3,478,742)
Net Carrying Amount 2,358,284 2,573,856
Trade names    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 1,081,083 1,081,083
Accumulated Amortization (941,429) (894,189)
Net Carrying Amount 139,654 186,894
Other amortizable intangibles    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 58,370 56,747
Accumulated Amortization (39,606) (36,381)
Net Carrying Amount $ 18,764 $ 20,366
Minimum | Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible asset, useful life 3 years  
Minimum | Trade names    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible asset, useful life 2 years  
Minimum | Other amortizable intangibles    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible asset, useful life 1 year  
Maximum | Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible asset, useful life 18 years  
Maximum | Trade names    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible asset, useful life 5 years  
Maximum | Other amortizable intangibles    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible asset, useful life 15 years