LONG-LIVED ASSETS (Definite-lived Intangibles) (Details) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Finite-lived Intangibles Asset [Roll Forward] |
|
|
|
|
| Gross carrying amount - Beginning of period |
|
$ 1,442,901
|
$ 1,241,170
|
|
| Accumulated amortization - Beginning of period |
|
(665,138)
|
(558,457)
|
|
| Net - Beginning of period |
|
777,763
|
682,713
|
|
| Gross carrying amount - Acquisitions - current year |
|
220,205
|
253,479
|
|
| Gross carrying amount - Acquisitions - prior year |
|
18,478
|
36,802
|
|
| Gross carrying amount - Dispositions |
|
(3,524)
|
|
|
| Gross carrying amount - Foreign exchange |
|
(40,292)
|
(31,719)
|
|
| Gross carrying amount - Other |
[1] |
(203,938)
|
(56,831)
|
|
| Gross carrying amount - Net Change |
|
(9,071)
|
201,731
|
|
| Accumulated amortization - Amortization |
|
(178,130)
|
(173,959)
|
|
| Accumulated amortization - Dispositions |
|
621
|
|
|
| Accumulated amortization - Foreign exchange |
|
16,411
|
10,446
|
|
| Accumulated amortization - Other |
[1] |
204,437
|
56,832
|
|
| Accumulated amortization - Net Change |
|
43,339
|
(106,681)
|
|
| Gross carrying amount - End of period |
|
1,433,830
|
1,442,901
|
$ 1,241,170
|
| Accumulated amortization - End of period |
|
(621,799)
|
(665,138)
|
(558,457)
|
| Net - End of period |
|
$ 812,031
|
$ 777,763
|
682,713
|
| Weighted-average lives of definite-lived intangible assets |
|
7 years
|
8 years
|
|
| Impairment of Intangible Assets, Finite-lived |
|
|
|
11,100
|
| Amortization of Intangible Assets |
|
$ 178,100
|
$ 174,000
|
154,700
|
| Estimate of amortization expense for each of the five succeeding fiscal years [Abstract] |
|
|
|
|
| 2017 |
|
177,921
|
|
|
| 2018 |
|
155,754
|
|
|
| 2019 |
|
131,077
|
|
|
| 2020 |
|
111,003
|
|
|
| 2021 |
|
77,837
|
|
|
| Revenue-generating contracts [Member] |
|
|
|
|
| Finite-lived Intangibles Asset [Roll Forward] |
|
|
|
|
| Gross carrying amount - Beginning of period |
|
700,795
|
635,127
|
|
| Accumulated amortization - Beginning of period |
|
(313,743)
|
(272,071)
|
|
| Net - Beginning of period |
|
387,052
|
363,056
|
|
| Gross carrying amount - Acquisitions - current year |
|
136,029
|
119,482
|
|
| Gross carrying amount - Acquisitions - prior year |
|
11,404
|
(8,366)
|
|
| Gross carrying amount - Dispositions |
|
0
|
|
|
| Gross carrying amount - Foreign exchange |
|
(25,360)
|
(15,332)
|
|
| Gross carrying amount - Other |
[1] |
(62,470)
|
(30,116)
|
|
| Gross carrying amount - Net Change |
|
59,603
|
65,668
|
|
| Accumulated amortization - Amortization |
|
(76,484)
|
(78,281)
|
|
| Accumulated amortization - Dispositions |
|
0
|
|
|
| Accumulated amortization - Foreign exchange |
|
10,555
|
6,494
|
|
| Accumulated amortization - Other |
[1] |
62,872
|
30,115
|
|
| Accumulated amortization - Net Change |
|
(3,057)
|
(41,672)
|
|
| Gross carrying amount - End of period |
|
760,398
|
700,795
|
635,127
|
| Accumulated amortization - End of period |
|
(316,800)
|
(313,743)
|
(272,071)
|
| Net - End of period |
|
$ 443,598
|
$ 387,052
|
363,056
|
| Weighted-average lives of definite-lived intangible assets |
|
8 years
|
8 years
|
|
| Client/vendor relationships [Member] |
|
|
|
|
| Finite-lived Intangibles Asset [Roll Forward] |
|
|
|
|
| Gross carrying amount - Beginning of period |
|
$ 379,282
|
$ 355,992
|
|
| Accumulated amortization - Beginning of period |
|
(169,620)
|
(123,195)
|
|
| Net - Beginning of period |
|
209,662
|
232,797
|
|
| Gross carrying amount - Acquisitions - current year |
|
42,861
|
39,113
|
|
| Gross carrying amount - Acquisitions - prior year |
|
782
|
(4,694)
|
|
| Gross carrying amount - Dispositions |
|
(2,299)
|
|
|
| Gross carrying amount - Foreign exchange |
|
(4,528)
|
(8,474)
|
|
| Gross carrying amount - Other |
[1] |
(14,089)
|
(2,655)
|
|
| Gross carrying amount - Net Change |
|
22,727
|
23,290
|
|
| Accumulated amortization - Amortization |
|
(60,815)
|
(51,116)
|
|
| Accumulated amortization - Dispositions |
|
599
|
|
|
| Accumulated amortization - Foreign exchange |
|
1,962
|
2,036
|
|
| Accumulated amortization - Other |
[1] |
14,089
|
2,655
|
|
| Accumulated amortization - Net Change |
|
(44,165)
|
(46,425)
|
|
| Gross carrying amount - End of period |
|
402,009
|
379,282
|
355,992
|
| Accumulated amortization - End of period |
|
(213,785)
|
(169,620)
|
(123,195)
|
| Net - End of period |
|
$ 188,224
|
$ 209,662
|
232,797
|
| 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 |
|
$ 86,556
|
$ 24,266
|
|
| Accumulated amortization - Beginning of period |
|
(14,578)
|
(8,701)
|
|
| Net - Beginning of period |
|
71,978
|
15,565
|
|
| Gross carrying amount - Acquisitions - current year |
|
5,100
|
62,953
|
|
| Gross carrying amount - Acquisitions - prior year |
|
3,618
|
0
|
|
| Gross carrying amount - Dispositions |
|
0
|
|
|
| Gross carrying amount - Foreign exchange |
|
(930)
|
(664)
|
|
| Gross carrying amount - Other |
[1] |
(6)
|
1
|
|
| Gross carrying amount - Net Change |
|
7,782
|
62,290
|
|
| Accumulated amortization - Amortization |
|
(9,623)
|
(6,218)
|
|
| Accumulated amortization - Dispositions |
|
0
|
|
|
| Accumulated amortization - Foreign exchange |
|
477
|
340
|
|
| Accumulated amortization - Other |
[1] |
0
|
1
|
|
| Accumulated amortization - Net Change |
|
(9,146)
|
(5,877)
|
|
| Gross carrying amount - End of period |
|
94,338
|
86,556
|
24,266
|
| Accumulated amortization - End of period |
|
(23,724)
|
(14,578)
|
(8,701)
|
| Net - End of period |
|
$ 70,614
|
$ 71,978
|
15,565
|
| Weighted-average lives of definite-lived intangible assets |
|
10 years
|
10 years
|
|
| Non-compete agreements [Member] |
|
|
|
|
| Finite-lived Intangibles Asset [Roll Forward] |
|
|
|
|
| Gross carrying amount - Beginning of period |
|
$ 176,354
|
$ 123,552
|
|
| Accumulated amortization - Beginning of period |
|
(121,319)
|
(98,512)
|
|
| Net - Beginning of period |
|
55,035
|
25,040
|
|
| Gross carrying amount - Acquisitions - current year |
|
9,550
|
5,110
|
|
| Gross carrying amount - Acquisitions - prior year |
|
1,500
|
49,851
|
|
| Gross carrying amount - Dispositions |
|
0
|
|
|
| Gross carrying amount - Foreign exchange |
|
(4,260)
|
(2,159)
|
|
| Gross carrying amount - Other |
[1] |
(117,152)
|
0
|
|
| Gross carrying amount - Net Change |
|
(110,362)
|
52,802
|
|
| Accumulated amortization - Amortization |
|
(19,195)
|
(22,869)
|
|
| Accumulated amortization - Dispositions |
|
0
|
|
|
| Accumulated amortization - Foreign exchange |
|
1,188
|
62
|
|
| Accumulated amortization - Other |
[1] |
117,227
|
0
|
|
| Accumulated amortization - Net Change |
|
99,220
|
(22,807)
|
|
| Gross carrying amount - End of period |
|
65,992
|
176,354
|
123,552
|
| Accumulated amortization - End of period |
|
(22,099)
|
(121,319)
|
(98,512)
|
| Net - End of period |
|
$ 43,893
|
$ 55,035
|
25,040
|
| Weighted-average lives of definite-lived intangible assets |
|
5 years
|
5 years
|
|
| Technology [Member] |
|
|
|
|
| Finite-lived Intangibles Asset [Roll Forward] |
|
|
|
|
| Gross carrying amount - Beginning of period |
|
$ 30,265
|
$ 15,330
|
|
| Accumulated amortization - Beginning of period |
|
(8,602)
|
(4,246)
|
|
| Net - Beginning of period |
|
21,663
|
11,084
|
|
| Gross carrying amount - Acquisitions - current year |
|
24,804
|
16,230
|
|
| Gross carrying amount - Acquisitions - prior year |
|
0
|
11
|
|
| Gross carrying amount - Dispositions |
|
0
|
|
|
| Gross carrying amount - Foreign exchange |
|
(1,364)
|
(1,306)
|
|
| Gross carrying amount - Other |
[1] |
(627)
|
0
|
|
| Gross carrying amount - Net Change |
|
22,813
|
14,935
|
|
| Accumulated amortization - Amortization |
|
(6,153)
|
(4,402)
|
|
| Accumulated amortization - Dispositions |
|
0
|
|
|
| Accumulated amortization - Foreign exchange |
|
491
|
46
|
|
| Accumulated amortization - Other |
[1] |
627
|
0
|
|
| Accumulated amortization - Net Change |
|
(5,035)
|
(4,356)
|
|
| Gross carrying amount - End of period |
|
53,078
|
30,265
|
15,330
|
| Accumulated amortization - End of period |
|
(13,637)
|
(8,602)
|
(4,246)
|
| Net - End of period |
|
$ 39,441
|
$ 21,663
|
11,084
|
| Weighted-average lives of definite-lived intangible assets |
|
5 years
|
6 years
|
|
| Venue management and leaseholds [Member] |
|
|
|
|
| Finite-lived Intangibles Asset [Roll Forward] |
|
|
|
|
| Gross carrying amount - Beginning of period |
|
$ 66,051
|
$ 83,322
|
|
| Accumulated amortization - Beginning of period |
|
(35,645)
|
(50,490)
|
|
| Net - Beginning of period |
|
30,406
|
32,832
|
|
| Gross carrying amount - Acquisitions - current year |
|
1,449
|
10,574
|
|
| Gross carrying amount - Acquisitions - prior year |
|
1,174
|
0
|
|
| Gross carrying amount - Dispositions |
|
(1,225)
|
|
|
| Gross carrying amount - Foreign exchange |
|
(3,848)
|
(3,784)
|
|
| Gross carrying amount - Other |
[1] |
(9,600)
|
(24,061)
|
|
| Gross carrying amount - Net Change |
|
(12,050)
|
(17,271)
|
|
| Accumulated amortization - Amortization |
|
(5,406)
|
(10,684)
|
|
| Accumulated amortization - Dispositions |
|
22
|
|
|
| Accumulated amortization - Foreign exchange |
|
1,765
|
1,468
|
|
| Accumulated amortization - Other |
[1] |
9,600
|
24,061
|
|
| Accumulated amortization - Net Change |
|
5,981
|
14,845
|
|
| Gross carrying amount - End of period |
|
54,001
|
66,051
|
83,322
|
| Accumulated amortization - End of period |
|
(29,664)
|
(35,645)
|
(50,490)
|
| Net - End of period |
|
$ 24,337
|
$ 30,406
|
32,832
|
| Weighted-average lives of definite-lived intangible assets |
|
5 years
|
8 years
|
|
| Other [Member] |
|
|
|
|
| Finite-lived Intangibles Asset [Roll Forward] |
|
|
|
|
| Gross carrying amount - Beginning of period |
|
$ 3,598
|
$ 3,581
|
|
| Accumulated amortization - Beginning of period |
|
(1,631)
|
(1,242)
|
|
| Net - Beginning of period |
|
1,967
|
2,339
|
|
| Gross carrying amount - Acquisitions - current year |
|
412
|
17
|
|
| Gross carrying amount - Acquisitions - prior year |
|
0
|
0
|
|
| Gross carrying amount - Dispositions |
|
0
|
|
|
| Gross carrying amount - Foreign exchange |
|
(2)
|
0
|
|
| Gross carrying amount - Other |
[1] |
6
|
0
|
|
| Gross carrying amount - Net Change |
|
416
|
17
|
|
| Accumulated amortization - Amortization |
|
(454)
|
(389)
|
|
| Accumulated amortization - Dispositions |
|
0
|
|
|
| Accumulated amortization - Foreign exchange |
|
(27)
|
0
|
|
| Accumulated amortization - Other |
[1] |
22
|
0
|
|
| Accumulated amortization - Net Change |
|
(459)
|
(389)
|
|
| Gross carrying amount - End of period |
|
4,014
|
3,598
|
3,581
|
| Accumulated amortization - End of period |
|
(2,090)
|
(1,631)
|
(1,242)
|
| Net - End of period |
|
$ 1,924
|
$ 1,967
|
$ 2,339
|
|
|