INVESTMENTS - Narrative (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) investment company	Dec. 31, 2016 USD ($) investment company	Dec. 31, 2015 USD ($)
Schedule of Investments [Line Items]
Investments made in private equity companies in exchange for advertising services	$ 35,523	$ 34,534
Number of investments made in private companies \| company	13	4
Number of investments accounted for under equity method of accounting \| investment	2	2
Number of investments accounted for under cost method \| investment	6	2
Number of investments accounted for as notes receivable convertible into equity \| investment	5
Barter revenue recognized	$ 243,300	$ 165,800	$ 133,500
Non-cash impairment on cost investment		14,500
Non-cash impairment on equity investment		15,000
Marketable equity securities held	1,500	1,700
Twelve private companies
Schedule of Investments [Line Items]
Barter revenue recognized	35,200	36,600
iHM \| Twelve private companies
Schedule of Investments [Line Items]
Investments made in private equity companies in exchange for advertising services	$ 34,700
iHM \| Four private companies
Schedule of Investments [Line Items]
Investments made in private equity companies in exchange for advertising services		$ 26,100

Number Of Investments Accounted For As Notes Receivable Convertible Into Equity

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Number Of Investments Accounted For Under Cost Method

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Number Of Investments Accounted For Under Equity Method

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Number Of Investments Made In Private Companies In Exchange For Advertising Services

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Total revenue recognized from advertising barter transactions for each income statement presented.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 20
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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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For an unclassified balance sheet, this item represents investments in common and preferred stocks and other forms of securities that provide ownership interests in a corporation.

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The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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