LONG-LIVED ASSETS (Definite-lived Intangibles) (Details) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Finite-lived Intangibles Asset [Roll Forward] |
|
|
|
|
| Gross carrying amount - Beginning of period |
|
$ 1,433,830
|
$ 1,442,901
|
|
| Accumulated amortization - Beginning of period |
|
(621,799)
|
(665,138)
|
|
| Net - Beginning of period |
|
812,031
|
777,763
|
|
| Gross carrying amount - Acquisitions - current year |
|
61,057
|
220,205
|
|
| Gross carrying amount - Acquisitions - prior year |
|
29,860
|
18,478
|
|
| Gross carrying amount - Dispositions |
|
|
(3,524)
|
|
| Gross carrying amount - Foreign exchange |
|
42,329
|
(40,292)
|
|
| Gross carrying amount - Other |
[1] |
(111,036)
|
(203,938)
|
|
| Gross carrying amount - Net Change |
|
22,210
|
(9,071)
|
|
| Accumulated amortization - Amortization |
|
(202,566)
|
(178,130)
|
$ (174,000)
|
| Accumulated amortization - Dispositions |
|
|
621
|
|
| Accumulated amortization - Foreign exchange |
|
(18,165)
|
16,411
|
|
| Accumulated amortization - Other |
[1] |
115,755
|
204,437
|
|
| Accumulated amortization - Net Change |
|
(104,976)
|
43,339
|
|
| Gross carrying amount - End of period |
|
1,456,040
|
1,433,830
|
1,442,901
|
| Accumulated amortization - End of period |
|
(726,775)
|
(621,799)
|
(665,138)
|
| Net - End of period |
|
$ 729,265
|
$ 812,031
|
777,763
|
| Weighted-average lives of definite-lived intangible assets |
|
6 years
|
8 years
|
|
| Estimate of amortization expense for each of the five succeeding fiscal years [Abstract] |
|
|
|
|
| 2018 |
|
$ 179,251
|
|
|
| 2019 |
|
151,852
|
|
|
| 2020 |
|
118,439
|
|
|
| 2021 |
|
81,950
|
|
|
| 2022 |
|
63,920
|
|
|
| Revenue-generating contracts [Member] |
|
|
|
|
| Finite-lived Intangibles Asset [Roll Forward] |
|
|
|
|
| Gross carrying amount - Beginning of period |
|
760,398
|
$ 700,795
|
|
| Accumulated amortization - Beginning of period |
|
(316,800)
|
(313,743)
|
|
| Net - Beginning of period |
|
443,598
|
387,052
|
|
| Gross carrying amount - Acquisitions - current year |
|
19,095
|
136,029
|
|
| Gross carrying amount - Acquisitions - prior year |
|
(6,724)
|
11,404
|
|
| Gross carrying amount - Dispositions |
|
|
0
|
|
| Gross carrying amount - Foreign exchange |
|
23,308
|
(25,360)
|
|
| Gross carrying amount - Other |
[1] |
(6,714)
|
(62,470)
|
|
| Gross carrying amount - Net Change |
|
28,965
|
59,603
|
|
| Accumulated amortization - Amortization |
|
(94,797)
|
(76,484)
|
|
| Accumulated amortization - Dispositions |
|
|
0
|
|
| Accumulated amortization - Foreign exchange |
|
(9,918)
|
10,555
|
|
| Accumulated amortization - Other |
[1] |
11,504
|
62,872
|
|
| Accumulated amortization - Net Change |
|
(93,211)
|
(3,057)
|
|
| Gross carrying amount - End of period |
|
789,363
|
760,398
|
700,795
|
| Accumulated amortization - End of period |
|
(410,011)
|
(316,800)
|
(313,743)
|
| Net - End of period |
|
$ 379,352
|
$ 443,598
|
387,052
|
| Weighted-average lives of definite-lived intangible assets |
|
7 years
|
8 years
|
|
| Client/vendor relationships [Member] |
|
|
|
|
| Finite-lived Intangibles Asset [Roll Forward] |
|
|
|
|
| Gross carrying amount - Beginning of period |
|
$ 402,009
|
$ 379,282
|
|
| Accumulated amortization - Beginning of period |
|
(213,785)
|
(169,620)
|
|
| Net - Beginning of period |
|
188,224
|
209,662
|
|
| Gross carrying amount - Acquisitions - current year |
|
22,635
|
42,861
|
|
| Gross carrying amount - Acquisitions - prior year |
|
0
|
782
|
|
| Gross carrying amount - Dispositions |
|
|
(2,299)
|
|
| Gross carrying amount - Foreign exchange |
|
10,457
|
(4,528)
|
|
| Gross carrying amount - Other |
[1] |
(93,652)
|
(14,089)
|
|
| Gross carrying amount - Net Change |
|
(60,560)
|
22,727
|
|
| Accumulated amortization - Amortization |
|
(61,550)
|
(60,815)
|
|
| Accumulated amortization - Dispositions |
|
|
599
|
|
| Accumulated amortization - Foreign exchange |
|
(4,460)
|
1,962
|
|
| Accumulated amortization - Other |
[1] |
93,438
|
14,089
|
|
| Accumulated amortization - Net Change |
|
27,428
|
(44,165)
|
|
| Gross carrying amount - End of period |
|
341,449
|
402,009
|
379,282
|
| Accumulated amortization - End of period |
|
(186,357)
|
(213,785)
|
(169,620)
|
| Net - End of period |
|
$ 155,092
|
$ 188,224
|
209,662
|
| Weighted-average lives of definite-lived intangible assets |
|
6 years
|
6 years
|
|
| Trademarks and naming rights [Member] |
|
|
|
|
| Finite-lived Intangibles Asset [Roll Forward] |
|
|
|
|
| Gross carrying amount - Beginning of period |
|
$ 94,338
|
$ 86,556
|
|
| Accumulated amortization - Beginning of period |
|
(23,724)
|
(14,578)
|
|
| Net - Beginning of period |
|
70,614
|
71,978
|
|
| Gross carrying amount - Acquisitions - current year |
|
0
|
5,100
|
|
| Gross carrying amount - Acquisitions - prior year |
|
35,464
|
3,618
|
|
| Gross carrying amount - Dispositions |
|
|
0
|
|
| Gross carrying amount - Foreign exchange |
|
1,429
|
(930)
|
|
| Gross carrying amount - Other |
[1] |
(4,900)
|
(6)
|
|
| Gross carrying amount - Net Change |
|
31,993
|
7,782
|
|
| Accumulated amortization - Amortization |
|
(13,315)
|
(9,623)
|
|
| Accumulated amortization - Dispositions |
|
|
0
|
|
| Accumulated amortization - Foreign exchange |
|
(560)
|
477
|
|
| Accumulated amortization - Other |
[1] |
4,918
|
0
|
|
| Accumulated amortization - Net Change |
|
(8,957)
|
(9,146)
|
|
| Gross carrying amount - End of period |
|
126,331
|
94,338
|
86,556
|
| Accumulated amortization - End of period |
|
(32,681)
|
(23,724)
|
(14,578)
|
| Net - End of period |
|
93,650
|
$ 70,614
|
71,978
|
| Weighted-average lives of definite-lived intangible assets |
|
|
10 years
|
|
| Technology [Member] |
|
|
|
|
| Finite-lived Intangibles Asset [Roll Forward] |
|
|
|
|
| Gross carrying amount - Beginning of period |
|
53,078
|
$ 30,265
|
|
| Accumulated amortization - Beginning of period |
|
(13,637)
|
(8,602)
|
|
| Net - Beginning of period |
|
39,441
|
21,663
|
|
| Gross carrying amount - Acquisitions - current year |
|
12,707
|
24,804
|
|
| Gross carrying amount - Acquisitions - prior year |
|
1,120
|
0
|
|
| Gross carrying amount - Dispositions |
|
|
0
|
|
| Gross carrying amount - Foreign exchange |
|
2,278
|
(1,364)
|
|
| Gross carrying amount - Other |
[1] |
(5,517)
|
(627)
|
|
| Gross carrying amount - Net Change |
|
10,588
|
22,813
|
|
| Accumulated amortization - Amortization |
|
(13,869)
|
(6,153)
|
|
| Accumulated amortization - Dispositions |
|
|
0
|
|
| Accumulated amortization - Foreign exchange |
|
(764)
|
491
|
|
| Accumulated amortization - Other |
[1] |
5,525
|
627
|
|
| Accumulated amortization - Net Change |
|
(9,108)
|
(5,035)
|
|
| Gross carrying amount - End of period |
|
63,666
|
53,078
|
30,265
|
| Accumulated amortization - End of period |
|
(22,745)
|
(13,637)
|
(8,602)
|
| Net - End of period |
|
$ 40,921
|
$ 39,441
|
21,663
|
| Weighted-average lives of definite-lived intangible assets |
|
3 years
|
5 years
|
|
| Noncompete Agreements [Member] |
|
|
|
|
| Finite-lived Intangibles Asset [Roll Forward] |
|
|
|
|
| Net - Beginning of period |
|
$ 43,900
|
|
|
| Net - End of period |
|
31,600
|
$ 43,900
|
|
| Venue management and leaseholds [Member] |
|
|
|
|
| Finite-lived Intangibles Asset [Roll Forward] |
|
|
|
|
| Net - Beginning of period |
|
24,300
|
|
|
| Net - End of period |
|
27,200
|
24,300
|
|
| Other Intangible Assets [Member] |
|
|
|
|
| Finite-lived Intangibles Asset [Roll Forward] |
|
|
|
|
| Gross carrying amount - Beginning of period |
|
124,007
|
246,003
|
|
| Accumulated amortization - Beginning of period |
|
(53,853)
|
(158,595)
|
|
| Net - Beginning of period |
|
70,154
|
87,408
|
|
| Gross carrying amount - Acquisitions - current year |
|
6,620
|
11,411
|
|
| Gross carrying amount - Acquisitions - prior year |
|
0
|
2,674
|
|
| Gross carrying amount - Dispositions |
|
|
(1,225)
|
|
| Gross carrying amount - Foreign exchange |
|
4,857
|
(8,110)
|
|
| Gross carrying amount - Other |
|
(253)
|
(126,746)
|
|
| Gross carrying amount - Net Change |
|
11,224
|
(121,996)
|
|
| Accumulated amortization - Amortization |
|
(19,035)
|
(25,055)
|
|
| Accumulated amortization - Dispositions |
|
|
22
|
|
| Accumulated amortization - Foreign exchange |
|
(2,463)
|
2,926
|
|
| Accumulated amortization - Other |
|
370
|
126,849
|
|
| Accumulated amortization - Net Change |
|
(21,128)
|
104,742
|
|
| Gross carrying amount - End of period |
|
135,231
|
124,007
|
246,003
|
| Accumulated amortization - End of period |
|
(74,981)
|
(53,853)
|
(158,595)
|
| Net - End of period |
|
$ 60,250
|
$ 70,154
|
$ 87,408
|
| Weighted-average lives of definite-lived intangible assets |
|
9 years
|
5 years
|
|
|
|