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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Barter and Trade Revenues and Expenses (Detail) - Trade and Barter Transactions - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue Recognition, Milestone Method [Line Items] |  |  |
Trade and barter revenues | $ 218,595 | $ 244,116 | $ 165,847
Trade and barter expenses | 210,677 | 202,251 | 115,078
iHM |  |  |
Revenue Recognition, Milestone Method [Line Items] |  |  |
Trade and barter revenues | 202,674 | 226,737 | 153,331
Trade and barter expenses | $ 199,982 | $ 190,906 | $ 103,129

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