XML 155 R127.htm IDEA: XBRL DOCUMENT
v3.21.4

Restricted Net Assets (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Restricted Net Assets (Details) [Line Items] |  |
Registered capital, percentage | 50.00% |
Statutory common reserve, percentage | 10.00% |
Amount of net assets (in Yuan Renminbi) | ¥ 4,211,944 | ¥ 4,251,792
PRC [Member] |  |
Restricted Net Assets (Details) [Line Items] |  |
General reserve, percentage | 10.00% |
Registered capital, percentage | 50.00% |

X
- Definition Percentage of general reserve. + References No definition available. + Details
Name: | uk_PercentageOfGeneralReserve
Namespace Prefix: | uk_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of registered capital. + References No definition available. + Details
Name: | uk_RegisteredCapitalPercentage
Namespace Prefix: | uk_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | uk_RestrictedNetAssetsDetailsLineItems
Namespace Prefix: | uk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of statutory common reserve. + References No definition available. + Details
Name: | uk_StatutoryCommonReservePercentage
Namespace Prefix: | uk_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of net assets (liabilities). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77885760&loc=SL35686385-199418 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 205 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118262037&loc=d3e9915-115836 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 220 -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(7)) -URI http://asc.fasb.org/extlink&oid=120401555&loc=SL114874367-224272 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 2 -Subparagraph (SX 210.6-05(4)) -URI http://asc.fasb.org/extlink&oid=120401414&loc=d3e604008-122996 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 220 -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(6)) -URI http://asc.fasb.org/extlink&oid=120401555&loc=SL114874367-224272 + Details
Name: | us-gaap_AssetsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_InvestmentTypeAxis=uk_PRCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |