Quarterly report pursuant to Section 13 or 15(d)

LONG-LIVED ASSETS (Definite-lived Intangibles) (Details)

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LONG-LIVED ASSETS (Definite-lived Intangibles) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Finite-lived Intangibles Asset [Roll Forward]    
Gross carrying amount $ 1,456,040  
Accumulated amortization (726,775)  
Net 729,265  
Acquisitions—current year 71,383  
Acquisitions—prior year (383)  
Foreign exchange 9,860  
Other (2) (6,011)  
Net change 74,849  
Amortization (45,734) $ (44,600)
Foreign exchange (5,097)  
Other(2) 6,043  
Net change (44,788)  
Gross carrying amount 1,530,889  
Accumulated amortization (771,563)  
Net $ 759,326  
Weighted-average lives of definite-lived intangible assets 8 years  
Revenue-generating contracts [Member]    
Finite-lived Intangibles Asset [Roll Forward]    
Gross carrying amount $ 789,363  
Accumulated amortization (410,011)  
Net 379,352  
Acquisitions—current year 1,157  
Acquisitions—prior year (977)  
Foreign exchange 5,791  
Other (2) 0  
Net change 5,971  
Amortization (18,947)  
Foreign exchange (3,190)  
Other(2) 0  
Net change (22,137)  
Gross carrying amount 795,334  
Accumulated amortization (432,148)  
Net $ 363,186  
Weighted-average lives of definite-lived intangible assets 3 years  
Client/vendor relationships [Member]    
Finite-lived Intangibles Asset [Roll Forward]    
Gross carrying amount $ 341,449  
Accumulated amortization (186,357)  
Net 155,092  
Acquisitions—current year 37,777  
Acquisitions—prior year 0  
Foreign exchange 2,126  
Other (2) (3,700)  
Net change 36,203  
Amortization (12,836)  
Foreign exchange (832)  
Other(2) 3,700  
Net change (9,968)  
Gross carrying amount 377,652  
Accumulated amortization (196,325)  
Net $ 181,327  
Weighted-average lives of definite-lived intangible assets 9 years  
Trademarks and naming rights [Member]    
Finite-lived Intangibles Asset [Roll Forward]    
Gross carrying amount $ 126,331  
Accumulated amortization (32,681)  
Net 93,650  
Acquisitions—current year 0  
Acquisitions—prior year 0  
Foreign exchange 67  
Other (2) 0  
Net change 67  
Amortization (3,139)  
Foreign exchange (163)  
Other(2) 8  
Net change (3,294)  
Gross carrying amount 126,398  
Accumulated amortization (35,975)  
Net 90,423  
Technology [Member]    
Finite-lived Intangibles Asset [Roll Forward]    
Gross carrying amount 63,666  
Accumulated amortization (22,745)  
Net 40,921  
Acquisitions—current year 20,466  
Acquisitions—prior year 194  
Foreign exchange 278  
Other (2) (5)  
Net change 20,933  
Amortization (5,565)  
Foreign exchange (110)  
Other(2) 28  
Net change (5,647)  
Gross carrying amount 84,599  
Accumulated amortization (28,392)  
Net $ 56,207  
Weighted-average lives of definite-lived intangible assets 3 years  
Other Intangible Assets [Member]    
Finite-lived Intangibles Asset [Roll Forward]    
Gross carrying amount $ 135,231  
Accumulated amortization (74,981)  
Net 60,250  
Acquisitions—current year 11,983  
Acquisitions—prior year 400  
Foreign exchange 1,598  
Other (2) (2,306)  
Net change 11,675  
Amortization (5,247)  
Foreign exchange (802)  
Other(2) 2,307  
Net change (3,742)  
Gross carrying amount 146,906  
Accumulated amortization (78,723)  
Net $ 68,183  
Weighted-average lives of definite-lived intangible assets 12 years