Name:	uk_AdditionalEquityOwnershipInterestPercentage
Namespace Prefix:	uk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Additional uncollected considerations.

No definition available.

Name:	uk_AdditionalUncollectedConsiderations
Namespace Prefix:	uk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

Name:	uk_HeldForSaleAssetsDetailsLineItems
Namespace Prefix:	uk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

No definition available.

Name:	uk_LossOnDisposalOfSubsidiaries
Namespace Prefix:	uk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Uncollected considerations.

No definition available.

Name:	uk_UncollectedConsiderations
Namespace Prefix:	uk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Net Increase or Decrease in balance of noncontrolling interest in the subsidiary during the reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683

Name:	us-gaap_MinorityInterestPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

Amount of consideration received by subsidiary or equity investee in exchange for shares of stock issued or sold. Includes amount of cash received, fair value of noncash assets received, and fair value of liabilities assumed by the investor.

No definition available.