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SEGMENT INFORMATION - Geographic Information about Revenue and Long-Lived Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Revenue and long-lived assets by geography          
Revenue $ 1,246,874 $ 1,104,592 $ 3,539,375 $ 3,158,789  
Long-lived assets (excluding goodwill and intangible assets) 361,664   361,664   $ 318,800
United States          
Revenue and long-lived assets by geography          
Revenue 807,188 738,599 2,293,664 2,104,750  
Long-lived assets (excluding goodwill and intangible assets) 336,055   336,055   289,756
All other countries          
Revenue and long-lived assets by geography          
Revenue 439,686 $ 365,993 1,245,711 $ 1,054,039  
Long-lived assets (excluding goodwill and intangible assets) $ 25,609   $ 25,609   $ 29,044