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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value measured on recurring basis (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount 1 | $ 0 |
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount 1 | 0 |
Fair Value, Liabilities, Level 3 Transfers, Amount 1 | 0 |
Available-for-Sale Securities |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance, beginning of period | 136,826 | $ 112,600
Change in fair value included within other comprehensive income |  | 10,400
Balance, end of period | 136,826 | 123,000
Employment Agreement Award |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance, beginning of period | 25,741 | 28,193
Change in fair value | (144) |
Change in fair value |  | 579
Balance, end of period | 25,597 | 28,772
Amount of total (losses)/income for the period included in earnings attributable to the change in unrealized losses/income relating to assets and liabilities still held at the reporting date | 144 | (579)
Redeemable noncontrolling interest |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance, beginning of period | 25,298 | 18,655
Net income attributable to redeemable noncontrolling interests | 511 | 701
Dividends paid to redeemable noncontrolling interests | (2,001) |
Change in fair value | 1,308 |
Change in fair value |  | 871
Balance, end of period | $ 25,116 | $ 20,227

X
- Definition Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

X
- Definition Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + References No definition available. + Details
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Namespace Prefix: | uone_
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X
- Definition Change enterprise in fair value that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

X
- Definition The element represents the amount of total losses for the period included in earnings attributable to the change in unrealized losses relating to assets and liabilities still held at the reporting date. + References No definition available. + Details
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- Definition Change enterprise in fair value that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition The amount of gain (loss) recognized in earnings, attributable to non controlling interest arising ,from liabilities measured at fair value on a recurring basis using unobservable inputs (level 3). + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition Cash outflow in the form of ordinary dividends to noncontrolling interests, generally out of earnings. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition 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. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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