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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Finite-lived Intangibles Asset [Roll Forward]        
Gross carrying amount     $ 1,433,830  
Accumulated amortization     (621,799)  
Net     812,031  
Acquisitions— current year     35,492  
Acquisitions— prior year     29,860  
Foreign exchange     39,228  
Other(1)     (8,589)  
Net change     95,991  
Amortization $ (53,400) $ (47,800) (143,395) $ (133,000)
Foreign exchange     (16,426)  
Other(1)     8,708  
Net change     (151,113)  
Gross carrying amount 1,529,821   1,529,821  
Accumulated amortization (772,912)   (772,912)  
Net 756,909   $ 756,909  
Weighted-average lives of definite-lived intangible assets     5 years  
Revenue-generating contracts [Member]        
Finite-lived Intangibles Asset [Roll Forward]        
Gross carrying amount     $ 760,398  
Accumulated amortization     (316,800)  
Net     443,598  
Acquisitions— current year     0  
Acquisitions— prior year     (6,724)  
Foreign exchange     21,823  
Other(1)     (5,027)  
Net change     10,072  
Amortization     (63,368)  
Foreign exchange     (8,966)  
Other(1)     5,067  
Net change     (67,267)  
Gross carrying amount 770,470   770,470  
Accumulated amortization (384,067)   (384,067)  
Net 386,403   386,403  
Client/vendor relationships [Member]        
Finite-lived Intangibles Asset [Roll Forward]        
Gross carrying amount     402,009  
Accumulated amortization     (213,785)  
Net     188,224  
Acquisitions— current year     22,635  
Acquisitions— prior year     0  
Foreign exchange     9,069  
Other(1)     (3,009)  
Net change     28,695  
Amortization     (45,688)  
Foreign exchange     (3,868)  
Other(1)     2,969  
Net change     (46,587)  
Gross carrying amount 430,704   430,704  
Accumulated amortization (260,372)   (260,372)  
Net 170,332   $ 170,332  
Weighted-average lives of definite-lived intangible assets     6 years  
Trademarks and naming rights [Member]        
Finite-lived Intangibles Asset [Roll Forward]        
Gross carrying amount     $ 94,338  
Accumulated amortization     (23,724)  
Net     70,614  
Acquisitions— current year     0  
Acquisitions— prior year     35,464  
Foreign exchange     1,402  
Other(1)     0  
Net change     36,866  
Amortization     (10,008)  
Foreign exchange     (499)  
Other(1)     10  
Net change     (10,497)  
Gross carrying amount 131,204   131,204  
Accumulated amortization (34,221)   (34,221)  
Net 96,983   96,983  
Noncompete Agreements [Member]        
Finite-lived Intangibles Asset [Roll Forward]        
Gross carrying amount     65,992  
Accumulated amortization     (22,099)  
Net     43,893  
Acquisitions— current year     0  
Acquisitions— prior year     0  
Foreign exchange     2,229  
Other(1)     (1)  
Net change     2,228  
Amortization     (10,407)  
Foreign exchange     (984)  
Other(1)     8  
Net change     (11,383)  
Gross carrying amount 68,220   68,220  
Accumulated amortization (33,482)   (33,482)  
Net 34,738   34,738  
Technology [Member]        
Finite-lived Intangibles Asset [Roll Forward]        
Gross carrying amount     53,078  
Accumulated amortization     (13,637)  
Net     39,441  
Acquisitions— current year     12,037  
Acquisitions— prior year     1,120  
Foreign exchange     2,170  
Other(1)     (305)  
Net change     15,022  
Amortization     (9,860)  
Foreign exchange     (718)  
Other(1)     312  
Net change     (10,266)  
Gross carrying amount 68,100   68,100  
Accumulated amortization (23,903)   (23,903)  
Net 44,197   $ 44,197  
Weighted-average lives of definite-lived intangible assets     4 years  
Venue management and leaseholds [Member]        
Finite-lived Intangibles Asset [Roll Forward]        
Gross carrying amount     $ 54,001  
Accumulated amortization     (29,664)  
Net     24,337  
Acquisitions— current year     820  
Acquisitions— prior year     0  
Foreign exchange     2,513  
Other(1)     0  
Net change     3,333  
Amortization     (3,524)  
Foreign exchange     (1,385)  
Other(1)     0  
Net change     (4,909)  
Gross carrying amount 57,334   57,334  
Accumulated amortization (34,573)   (34,573)  
Net 22,761   $ 22,761  
Weighted-average lives of definite-lived intangible assets     3 years  
Other Intangible Assets [Member]        
Finite-lived Intangibles Asset [Roll Forward]        
Gross carrying amount     $ 4,014  
Accumulated amortization     (2,090)  
Net     1,924  
Acquisitions— current year     0  
Acquisitions— prior year     0  
Foreign exchange     22  
Other(1)     (247)  
Net change     (225)  
Amortization     (540)  
Foreign exchange     (6)  
Other(1)     342  
Net change     (204)  
Gross carrying amount 3,789   3,789  
Accumulated amortization (2,294)   (2,294)  
Net $ 1,495   $ 1,495