SEGMENT DATA - Schedule of Reportable Segment Results (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Revenue $ 728,404 $ 644,430 $ 671,588 $ 544,280 $ 716,931 $ 667,255 $ 706,800 $ 588,836 $ 2,588,702 $ 2,679,822 $ 2,806,204
Direct operating expenses 370,592 357,946 352,017 329,212 352,412 361,660 361,987 342,260 1,409,767 1,418,319 1,485,835
Selling, general and administrative expenses 128,616 128,539 126,117 115,941 126,889 126,164 135,567 126,801 499,213 515,421 527,821
Corporate expenses 38,465 35,333 35,340 34,540 31,436 28,103 29,673 28,224 143,678 117,436 116,523
Depreciation and amortization 89,111 81,096 78,290 77,494 85,975 85,780 86,974 85,395 325,991 344,124 375,962
Impairment charges 2,568 1,591 0 0 0 7,274 0 0 4,159 7,274 21,631
Other operating income, net (2,266) (11,783) 7,829 32,611 128,203 1,095 (59,384) 284,774 26,391 354,688 (4,824)
Operating income 96,786 $ 28,142 $ 87,653 $ 19,704 248,422 $ 59,369 $ 33,215 $ 290,930 232,285 631,936 273,608
Segment assets 4,670,782       5,708,370       4,670,782 5,708,370 6,295,975
Capital expenditures                 224,238 229,772 218,332
Share-based compensation expense                 9,590 10,291 8,502
Operating segments | Americas Outdoor Advertising                      
Segment Reporting Information [Line Items]                      
Revenue                 1,161,059 1,187,180 1,265,267
Direct operating expenses                 527,536 528,769 558,357
Selling, general and administrative expenses                 197,390 203,427 211,329
Corporate expenses                 0 0 0
Depreciation and amortization                 179,119 175,438 193,775
Impairment charges                 0 0 0
Other operating income, net                 0 0 0
Operating income                 257,014 279,546 301,806
Segment assets 2,850,303       3,046,369       2,850,303 3,046,369 3,444,922
Capital expenditures                 70,936 78,289 71,404
Share-based compensation expense                 0 0 0
Operating segments | International Outdoor Advertising                      
Segment Reporting Information [Line Items]                      
Revenue                 1,427,643 1,492,642 1,540,937
Direct operating expenses                 882,231 889,550 927,478
Selling, general and administrative expenses                 301,823 311,994 316,492
Corporate expenses                 0 0 0
Depreciation and amortization                 141,812 162,974 176,799
Impairment charges                 0 0 0
Other operating income, net                 0 0 0
Operating income                 101,777 128,124 120,168
Segment assets 1,568,388       1,460,884       1,568,388 1,460,884 1,685,190
Capital expenditures                 150,036 146,900 143,315
Share-based compensation expense                 0 0 0
Corporate and other reconciling items                      
Segment Reporting Information [Line Items]                      
Revenue                 0 0 0
Direct operating expenses                 0 0 0
Selling, general and administrative expenses                 0 0 0
Corporate expenses                 143,678 117,436 116,523
Depreciation and amortization                 5,060 5,712 5,388
Impairment charges                 4,159 7,274 21,631
Other operating income, net                 26,391 354,688 (4,824)
Operating income                 (126,506) 224,266 (148,366)
Segment assets $ 252,091       $ 1,201,117       252,091 1,201,117 1,165,863
Capital expenditures                 3,266 4,583 3,613
Share-based compensation expense                 $ 9,590 $ 10,291 $ 8,502