STOCKHOLDERS' DEFICIT - Summary of Unvested Options and Changes (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Options
Granted (in shares)	0	0	0
Parent Company
Options
Unvested at beginning of period (in shares)	543,000
Granted (in shares)	0
Vested (in shares)	0
Forfeited (in shares)	0
Unvested at end of period (in shares)	543,000	543,000
Weighted Average Grant Date Fair Value
Unvested at beginning of period (in dollars per share)	$ 19.61
Unvested at end of period (in dollars per share)	$ 19.61	$ 19.61
Total fair value of options vested	$ 0.0	$ 0.2	$ 0.3
CCOH
Options
Unvested at beginning of period (in shares)	1,164,000
Granted (in shares)	4,000
Vested (in shares)	(354,000)
Forfeited (in shares)	(96,000)
Unvested at end of period (in shares)	718,000	1,164,000
Weighted Average Grant Date Fair Value
Unvested at beginning of period (in dollars per share)	$ 4.25
Granted (in dollars per share)	2.04	$ 2.82	$ 4.25
Vested (in dollars per share)	4.37
Forfeited (in dollars per share)	4.15
Unvested at end of period (in dollars per share)	$ 4.19	$ 4.25
Total fair value of options vested	$ 1.6	$ 2.7	$ 4.2