Area of a real estate property.

No definition available.

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- Definition

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

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 18

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-SubTopic 10

-Section 50

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

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-Paragraph 20

-Subparagraph a (1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570

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- Definition

The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 16

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

This line item represents the percentage of additional interest purchased in specified entity.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

The additional percentage of Sale of ownership of common stock or equity participation in the specified entity to the outside investors.

+ References

No definition available.

+ Details

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Namespace Prefix:	usnu_
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- Definition

The percentage of ownership of common stock or equity participation in the specified entity by outside investors.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

This line item represents the percentage of interest in medical office building.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

The cash inflow associated with the sale of additional interest to certain investors.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

The cash inflow associated with the sale of ownership interest to certain investors.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

The reduced percentage of ownership of common stock or equity participation in the specified entity by wholly owned subsidiary of the reporting entity.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

The percentage of Sale of ownership of common stock or equity participation in the specified entity to the outside investors.

+ References

No definition available.

+ Details

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Boca Oncology Partners (Details) (USD $)			3 Months Ended			3 Months Ended	12 Months Ended
Boca Oncology Partners (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011 sqft	Mar. 31, 2012 USNC [Member]	Mar. 31, 2012 Boca Oncology Partners, LLC [Member]	Dec. 31, 2011 Boca Oncology Partners, LLC [Member] sqft	Mar. 31, 2012 Boca Oncology Partners RE, LLC [Member]	Dec. 31, 2011 Boca Oncology Partners RE, LLC [Member]	Dec. 31, 2011 BOP and BOPRE [Member]	Dec. 31, 2011 BOP and BOPRE [Member] USNC [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of interest in medical office building (in hundredths)							20.00%
Area of building (in square feet)		32,000			6,000
Investment in BOP and BOPRE	$ 330,000	$ 471,000							$ 225,000
Ownership percentage in BOP and BOPRE (in hundredths)									22.50%
Ownership percentage by outside investors (in hundredths)								77.50%
Sale of ownership percentage to outside investors (in hundredths)				50.00%
Reduced ownership percentage (in hundredths)			11.25%
Proceeds from sale of ownership interest						250,000
Proceeds from sale of interest to certain investors			46,000
Additional interest purchased in specified entity (in hundredths)						3.75%
Additional sale of ownership percentage to outside investors (in hundredths)						30.00%
Proceeds from sale of additional interest			$ 27,000			$ 124,000