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GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill Rollforward (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
Goodwill [Roll Forward]  
Balance at December 31, 2016 $ 4,807,594
Goodwill acquired 704,020
Effect of foreign currency translation 74,259
Measurement-period adjustments 30,541
Balance at September 30, 2017 5,616,414
North America  
Goodwill [Roll Forward]  
Balance at December 31, 2016 4,083,252
Goodwill acquired 704,020
Effect of foreign currency translation 5,559
Measurement-period adjustments 23,511
Balance at September 30, 2017 4,816,342
Europe  
Goodwill [Roll Forward]  
Balance at December 31, 2016 455,300
Goodwill acquired 0
Effect of foreign currency translation 50,515
Measurement-period adjustments 0
Balance at September 30, 2017 505,815
Asia-Pacific  
Goodwill [Roll Forward]  
Balance at December 31, 2016 269,042
Goodwill acquired 0
Effect of foreign currency translation 18,185
Measurement-period adjustments 7,030
Balance at September 30, 2017 $ 294,257