v2.4.0.6

Accounting Policies (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 property | Dec. 31, 2010 property | Dec. 31, 2009
Redeemable Limited Partnership Unitholder Interests |  |  |
Number of entity shares issued in exchange for redemption of OP Units | 0.7866 |  |
Fair value of operating partnership units exceeding cost | $ 102,837 | $ 0 |
Noncontrolling Interest |  |  |
Number of properties having controlling interests owned through joint ventures | 29 | 6 |
Noncontrolling interest share in properties owned through joint ventures | 80,987 | 3,479 |
Net (loss) income attributable to noncontrolling interest, net of tax | $ (1,232) | $ 3,562 | $ 2,865
NHP/PMB L.P. |  |  |
Redeemable Limited Partnership Unitholder Interests |  |  |
Number of entity shares issued in exchange for redemption of OP Units | 0.7866 |  |
NHP/PMB L.P. | Class A Units |  |  |
Redeemable Limited Partnership Unitholder Interests |  |  |
Limited partnership units held by third party investors (in shares) | 2,371,415 |  |
Percentage of ownership interest on total units outstanding | 28.90% |  |
NHP/PMB L.P. | Class B Units |  |  |
Redeemable Limited Partnership Unitholder Interests |  |  |
Percentage of ownership interest on total units outstanding | 71.10% |  |
Limited partnership units outstanding (in shares) | 5,845,038 |  |

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- Definition The carrying value (book value) of an entity's issued and outstanding stock which is not included within permanent equity in Stockholders Equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + 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 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number D-98 -Paragraph 2 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph i Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Subparagraph a -Article 5 + Details
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