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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Finite-lived Intangibles Asset [Roll Forward]        
Gross carrying amount     $ 1,456,040  
Accumulated amortization     (726,775)  
Net     729,265  
Acquisitions—current year     106,644  
Acquisitions—prior year     (83)  
Foreign exchange     (15,474)  
Other (2)     (10,541)  
Net change     80,546  
Amortization $ (46,400) $ (45,400) (92,162) $ (90,000)
Foreign exchange     8,333  
Other (2)     10,906  
Net change     (72,923)  
Gross carrying amount 1,536,586   1,536,586  
Accumulated amortization (799,698)   (799,698)  
Net 736,888   $ 736,888  
Weighted-average lives of definite-lived intangible assets     7 years  
Estimate of amortization expense for each of the five succeeding fiscal years [Abstract]        
July 1 - December 31, 2018 108,750   $ 108,750  
2019 168,845   168,845  
2020 134,507   134,507  
2021 90,962   90,962  
2022 73,004   73,004  
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     6,128  
Acquisitions—prior year     (1,977)  
Foreign exchange     (7,723)  
Other (2)     (2,862)  
Net change     (6,434)  
Amortization     (37,891)  
Foreign exchange     3,734  
Other (2)     3,162  
Net change     (30,995)  
Gross carrying amount 782,929   782,929  
Accumulated amortization (441,006)   (441,006)  
Net 341,923   $ 341,923  
Weighted-average lives of definite-lived intangible assets     7 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     64,321  
Acquisitions—prior year     0  
Foreign exchange     (4,134)  
Other (2)     (3,698)  
Net change     56,489  
Amortization     (26,204)  
Foreign exchange     2,688  
Other (2)     3,700  
Net change     (19,816)  
Gross carrying amount 397,938   397,938  
Accumulated amortization (206,173)   (206,173)  
Net 191,765   $ 191,765  
Weighted-average lives of definite-lived intangible assets     8 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     (884)  
Other (2)     0  
Net change     (884)  
Amortization     (6,261)  
Foreign exchange     246  
Other (2)     16  
Net change     (5,999)  
Gross carrying amount 125,447   125,447  
Accumulated amortization (38,680)   (38,680)  
Net 86,767   86,767  
Technology [Member]        
Finite-lived Intangibles Asset [Roll Forward]        
Gross carrying amount     63,666  
Accumulated amortization     (22,745)  
Net     40,921  
Acquisitions—current year     22,433  
Acquisitions—prior year     194  
Foreign exchange     (799)  
Other (2)     (1,675)  
Net change     20,153  
Amortization     (11,064)  
Foreign exchange     457  
Other (2)     1,697  
Net change     (8,910)  
Gross carrying amount 83,819   83,819  
Accumulated amortization (31,655)   (31,655)  
Net 52,164   $ 52,164  
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     13,762  
Acquisitions—prior year     1,700  
Foreign exchange     (1,934)  
Other (2)     (2,306)  
Net change     11,222  
Amortization     (10,742)  
Foreign exchange     1,208  
Other (2)     2,331  
Net change     (7,203)  
Gross carrying amount 146,453   146,453  
Accumulated amortization (82,184)   (82,184)  
Net $ 64,269   $ 64,269  
Weighted-average lives of definite-lived intangible assets     12 years