Annual report pursuant to Section 13 and 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 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finite-lived Intangible Assets [Roll Forward]        
Gross carrying amount - beginning of period   $ 1,416,016 $ 1,456,040  
Accumulated amortization - beginning of period   (754,565) (726,775)  
Net   661,451 729,265  
Acquisitions—current year   435,480 137,772  
Acquisitions—prior year   43 6,347  
Dispositions     (30,566)  
Foreign exchange   (3,488) (28,395)  
Other (2)   (204,926) [1] (125,182)  
Net change   227,109 (40,024)  
Amortization   (223,532) (190,653) $ (202,600)
Dispositions     21,384  
Foreign exchange   179 15,827  
Other (2)   204,934 [1] 125,652  
Net change   (18,419) (27,790)  
Gross carrying amount - end of period   1,643,125 1,416,016 1,456,040
Accumulated amortization - end of period   (772,984) (754,565) (726,775)
Net   $ 870,141 $ 661,451 729,265
Weighted Average Useful Life of Finite-lived Intangible Assets,   8 years 7 years  
Impairment charges related to definite-lived intangible assets $ 19,400 $ 26,751    
Estimate of amortization expense for each of the five succeeding fiscal years [Abstract]        
2020   219,927    
2021   153,233    
2022   122,808    
2023   103,253    
2024   85,218    
Revenue-generating contracts [Member]        
Finite-lived Intangible Assets [Roll Forward]        
Gross carrying amount - beginning of period   692,963 $ 789,363  
Accumulated amortization - beginning of period   (391,002) (410,011)  
Net   301,961 379,352  
Acquisitions—current year   94,464 6,128  
Acquisitions—prior year   0 4,447  
Dispositions     0  
Foreign exchange   (4,713) (14,426)  
Other (2)   (82,157) [1] (92,549)  
Net change   7,594 (96,400)  
Amortization   (94,439) (81,291)  
Dispositions     0  
Foreign exchange   1,331 7,526  
Other (2)   82,088 [1] 92,774  
Net change   (11,020) 19,009  
Gross carrying amount - end of period   700,557 692,963 789,363
Accumulated amortization - end of period   (402,022) (391,002) (410,011)
Net   $ 298,535 $ 301,961 379,352
Weighted Average Useful Life of Finite-lived Intangible Assets,   8 years 7 years  
Client vendor relationships [Member]        
Finite-lived Intangible Assets [Roll Forward]        
Gross carrying amount - beginning of period   $ 393,772 $ 341,449  
Accumulated amortization - beginning of period   (213,599) (186,357)  
Net   180,173 155,092  
Acquisitions—current year   209,398 84,146  
Acquisitions—prior year   0 0  
Dispositions     (11,812)  
Foreign exchange   90 (7,378)  
Other (2)   (75,770) [1] (12,633)  
Net change   133,718 52,323  
Amortization   (65,059) (52,879)  
Dispositions     8,146  
Foreign exchange   (473) 4,813  
Other (2)   75,770 [1] 12,678  
Net change   10,238 (27,242)  
Gross carrying amount - end of period   527,490 393,772 341,449
Accumulated amortization - end of period   (203,361) (213,599) (186,357)
Net   $ 324,129 $ 180,173 155,092
Weighted Average Useful Life of Finite-lived Intangible Assets,   9 years 7 years  
Trademarks and naming rights [Member]        
Finite-lived Intangible Assets [Roll Forward]        
Gross carrying amount - beginning of period   $ 123,707 $ 126,331  
Accumulated amortization - beginning of period   (41,808) (32,681)  
Net   81,899 93,650  
Acquisitions—current year   29,061 2,067  
Acquisitions—prior year   0 0  
Dispositions     0  
Foreign exchange   91 (1,756)  
Other (2)   76 [1] (2,935)  
Net change   29,228 (2,624)  
Amortization   (14,513) (12,633)  
Dispositions     0  
Foreign exchange   (96) 536  
Other (2)   1 [1] 2,970  
Net change   (14,608) (9,127)  
Gross carrying amount - end of period   152,935 123,707 126,331
Accumulated amortization - end of period   (56,416) (41,808) (32,681)
Net   $ 96,519 $ 81,899 93,650
Weighted Average Useful Life of Finite-lived Intangible Assets,   8 years 3 years  
Venue management and leaseholds [Member]        
Finite-lived Intangible Assets [Roll Forward]        
Gross carrying amount - beginning of period   $ 70,048 $ 63,135  
Accumulated amortization - beginning of period   (33,507) (35,953)  
Net   36,541 27,182  
Acquisitions—current year   80,643 15,402  
Acquisitions—prior year   43 1,900  
Dispositions     0  
Foreign exchange   896 (1,989)  
Other (2)   (2,044) (8,400)  
Net change   79,538 6,913  
Amortization   (10,683) (7,185)  
Dispositions     0  
Foreign exchange   (553) 1,235  
Other (2)   2,044 8,396  
Net change   (9,192) 2,446  
Gross carrying amount - end of period   149,586 70,048 63,135
Accumulated amortization - end of period   (42,699) (33,507) (35,953)
Net   $ 106,887 $ 36,541 27,182
Weighted Average Useful Life of Finite-lived Intangible Assets,   10 years 12 years  
Technology [Member]        
Finite-lived Intangible Assets [Roll Forward]        
Gross carrying amount - beginning of period   $ 85,411 $ 63,666  
Accumulated amortization - beginning of period   (38,826) (22,745)  
Net   46,585 40,921  
Acquisitions—current year   13,839 30,029  
Acquisitions—prior year   0 0  
Dispositions     0  
Foreign exchange   356 (1,626)  
Other (2)   (12,268) [1] (6,658)  
Net change   1,927 21,745  
Amortization   (27,512) (23,727)  
Dispositions     0  
Foreign exchange   (152) 973  
Other (2)   12,270 [1] 6,673  
Net change   (15,394) (16,081)  
Gross carrying amount - end of period   87,338 85,411 63,666
Accumulated amortization - end of period   (54,220) (38,826) (22,745)
Net   $ 33,118 $ 46,585 40,921
Weighted Average Useful Life of Finite-lived Intangible Assets,   2 years 3 years  
Other Intangible Assets [Member]        
Finite-lived Intangible Assets [Roll Forward]        
Gross carrying amount - beginning of period   $ 50,115 $ 72,096  
Accumulated amortization - beginning of period   (35,823) (39,028)  
Net   14,292 33,068  
Acquisitions—current year   8,075 0  
Acquisitions—prior year   0 0  
Dispositions     (18,754)  
Foreign exchange   (208) (1,220)  
Other (2)   (32,763) (2,007)  
Net change   (24,896) (21,981)  
Amortization   (11,326) (12,938)  
Dispositions     13,238  
Foreign exchange   122 744  
Other (2)   32,761 2,161  
Net change   21,557 3,205  
Gross carrying amount - end of period   25,219 50,115 72,096
Accumulated amortization - end of period   (14,266) (35,823) (39,028)
Net   $ 10,953 $ 14,292 $ 33,068
Weighted Average Useful Life of Finite-lived Intangible Assets,   5 years    
[1] Other primarily includes netdowns of fully amortized or impaired assets.