Real Property Acquisitions and Development (Details Textuals) (USD $)	Jun. 30, 2011	Mar. 31, 2011
Genesis Acquisition [Member]
Real Property Acquisitions and Development (Textuals) [Abstract]
Number of properties acquired of substantially all of the real estate assets		147
Total purchase price		$ 2,475,144,000
Cash consideration of capital lease obligation		2,400,000,000
Allocated on preliminary basis to land and land improvements		144,091,000
Allocated on preliminary basis to buildings and improvements		2,331,053,000
Capital lease obligations		75,144,000
Rent received from master lease		198,000,000
Initial term of master lease		15 years
Genesis Acquisition [Member] \| Minimum [Member]
Real Property Acquisitions and Development (Textuals) [Abstract]
Master lease agreement term		2 years
Genesis Acquisition [Member] \| Maximum [Member]
Real Property Acquisitions and Development (Textuals) [Abstract]
Master lease agreement term		6 years
Silverado Partnership [Member]
Real Property Acquisitions and Development (Textuals) [Abstract]
Allocated on preliminary basis to land and land improvements	11,170,000
Allocated on preliminary basis to buildings and improvements	173,841,000
Number of properties in portfolio		18
Percentage of interest owned by company in partnership		95.40%
Percentage of interest owned by minority		4.60%
Number of previous facilities under partnership owned by company		six
Number of facilities under partnership previously owned by partner		12
Contribution by the company for the formation of the partnership		163,368,000
Benchmark partnership [Member]
Real Property Acquisitions and Development (Textuals) [Abstract]
Allocated on preliminary basis to land and land improvements	60,440,000
Allocated on preliminary basis to buildings and improvements	792,394,000
Number of properties in portfolio		34
Percentage of interest owned by company in partnership		95.00%
Percentage of interest owned by minority		5.00%
Contribution by the company for the formation of the partnership		$ 380,278,000
Minimum [Member]
Real Property Acquisitions and Development (Textuals) [Abstract]
Increase in master lease agreement rent		1.75%
Minimum [Member] \| 7-15 year [Member]
Real Property Acquisitions and Development (Textuals) [Abstract]
Increase in master lease agreement rent		1.50%
Maximum [Member]
Real Property Acquisitions and Development (Textuals) [Abstract]
Increase in master lease agreement rent		3.50%
Maximum [Member] \| 7-15 year [Member]
Real Property Acquisitions and Development (Textuals) [Abstract]
Increase in master lease agreement rent		3.00%

Business acquisition purchase price allocation buildings and improvements.

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- Definition

Business acquisition purchase price allocation land and land improvements.

+ Details

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Balance Type:	debit
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- Definition

Contribution by company for formation of partnership.

+ Details

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- Definition

Increase in master lease agreement rent.

+ Details

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- Definition

Initial term of master lease

+ Details

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- Definition

Master Lease Agreement Term In Years.

+ Details

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- Definition

Number of facilities under partnership previously owned by company.

+ Details

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- Definition

Number of facilities under partnership previous owned by minority.

+ Details

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- Definition

Number of properties acquired expected to be allocated to the tangible and intangible assets.

+ Details

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- Definition

Number of properties in portfolio.

+ Details

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- Definition

Percentage of assets owned by minority.

+ Details

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- Definition

Percentage of interest in housing portfolio.

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- Definition

Real Property Acquisitions and Development.

+ Details

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- Definition

Real property acquisitions Capital lease obligations.

+ Details

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- Definition

Rent received from master lease.

+ Details

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- Definition

Amount of cash paid to acquire the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph f(1)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph d

+ Details

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- Definition

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph d

+ Details

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