BASIS OF PRESENTATION - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2019	May 02, 2019	May 01, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 277,050			$ 224,037
Restricted cash included in:
Other current assets	11,287			3,428
Total cash, cash equivalents and restricted cash in the Statement of Cash Flows	$ 288,337	$ 74,009	$ 74,009	430,334	$ 338,097	$ 311,300
Total cash, cash equivalents and restricted cash in the Statement of Cash Flows				227,465
CCOH | Other Assets
Restricted cash included in:
Total cash, cash equivalents and restricted cash in the Statement of Cash Flows				$ 202,800