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PROPERTY AND EQUIPMENT, NET - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 512,641 $ 461,641
Less: Accumulated depreciation and amortization (237,355) (228,121)
Property and equipment, net 275,286 233,520
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 202,430 168,125
Computer equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 161,880 139,174
Capitalized software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 107,200 119,452
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 41,131 $ 34,890