This element represents that, the stock price per share of additional common stock repurchased.

No definition available.

Name:	uone_AdditionalRepurchaseOfCommonStockPricePerShare
Namespace Prefix:	uone_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

It represents additional common stock shares repurchased.

+ References

No definition available.

+ Details

Name:	uone_AdditionalRepurchaseOfCommonStockShares
Namespace Prefix:	uone_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

It represents the additional value of Repurchase Of Common Stock Value.

+ References

No definition available.

+ Details

Name:	uone_AdditionalRepurchaseOfCommonStockValue
Namespace Prefix:	uone_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This element represents that, the stock price per share of common stock repurchased.

+ References

No definition available.

+ Details

Name:	uone_RepurchaseOfCommonStockPricePerShare
Namespace Prefix:	uone_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

It represents common stock shares repurchased.

+ References

No definition available.

+ Details

Name:	uone_RepurchaseOfCommonStockShares
Namespace Prefix:	uone_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

It represents the value of Repurchase Of Common Stock Value.

+ References

No definition available.

+ Details

Name:	uone_RepurchaseOfCommonStockValue
Namespace Prefix:	uone_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=uone_FounderAndExecutiveChairpersonMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=uone_CommonClassDMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=uone_PresidentAndChiefExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=uone_ExecutiveVicePresidentAndChiefFinancialOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
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Balance Type:
Period Type:

SUBSEQUENT EVENTS (Details Textual) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended	12 Months Ended
	Mar. 12, 2018	Jan. 05, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
Employee Stock Option [Member]
Subsequent Event [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross				1,204,000	0
Restricted Stock [Member]
Subsequent Event [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures				2,211,378	237,728
Founder and Executive Chairperson [Member] \| Employee Stock Option [Member] \| Common Class D [Member]
Subsequent Event [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross		210,937
Founder and Executive Chairperson [Member] \| Restricted Stock [Member] \| Common Class D [Member]
Subsequent Event [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		474,609
President and Chief Executive Officer [Member] \| Employee Stock Option [Member] \| Common Class D [Member]
Subsequent Event [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross		351,562
President and Chief Executive Officer [Member] \| Restricted Stock [Member] \| Common Class D [Member]
Subsequent Event [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		791,015
Executive Vice President and Chief Financial Officer [Member] \| Employee Stock Option [Member] \| Common Class D [Member]
Subsequent Event [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross		120,370
Executive Vice President and Chief Financial Officer [Member] \| Restricted Stock [Member] \| Common Class D [Member]
Subsequent Event [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		270,833
Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Repurchase Amount	$ 11.0
Debt Instrument, Redemption Price, Percentage	97.375%
Subsequent Event [Member] \| Common Class D [Member]
Subsequent Event [Line Items]
Repurchase Of Common Stock Shares			567,791
Repurchase Of Common Stock Price Per Share			$ 1.80
Repurchase Of Common Stock Value			$ 1.0
Additional Repurchase Of Common Stock, Shares			753,955
Additional Repurchase Of Common Stock, Value			$ 1.4
Additional Repurchase Of Common Stock Price, Per Share			$ 1.87