NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Variable Interest Entities, Additional Information (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) license	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($) license
Variable Interest Entity [Line Items]
Media revenues	$ 578,889	$ 504,775
Income from equity and cost method investments	423	3,146
Eliminations
Variable Interest Entity [Line Items]
Media revenues	$ (18,474)	(18,899)
Consolidated VIEs, aggregated
Variable Interest Entity [Line Items]
Initial term of certain outsourcing agreements	5 years
Number of licensees as VIEs (license) | license	37		37
Media revenues	$ 71,600	64,800
Consolidated VIEs | Eliminations
Variable Interest Entity [Line Items]
Liabilities associated with the certain outsourcing agreements and purchase options	78,100		$ 72,500
Consolidated VIEs | Cunningham | Eliminations
Variable Interest Entity [Line Items]
Total payments made under the LMA excluded from liabilities	38,400		37,600
Total capital leased liabilities excluded from VIE consolidation	4,400		4,500
VIEs which are not primary beneficiary
Variable Interest Entity [Line Items]
Carrying amount	103,300		$ 18,100
Income from equity and cost method investments	$ 400	$ 3,300