The number of general partner units issued.

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The number of general partner units outstanding.

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- Definition

The number of limited partner units issued.

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- Definition

The number of limited partner units outstanding.

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- Definition

Amount to be paid per share that is classified as temporary equity by entity upon redemption. 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 put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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ACCOUNTING POLICIES (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended			6 Months Ended		6 Months Ended
	Jun. 30, 2013 tranche	Dec. 31, 2012	Jun. 30, 2013 NHPPMBLP [Member]	Jun. 30, 2013 NHPPMBLP [Member] Class A Units	Jul. 31, 2013 NHPPMBLP [Member] Class A Units	Jun. 30, 2013 NHPPMBLP [Member] Class B Units	Jul. 31, 2013 NHPPMBLP [Member] Class B Units
Redeemable Noncontrolling Interest [Line Items]
Limited partnership units held by third party investors (in shares)				2,252,590
Percentage of ownership interest on total units outstanding				27.00%		73.00%
Limited partnership units outstanding (in shares)						6,104,969
Number of entity shares issued in exchange for redemption of OP Units			$ 0.7866
Limited Partners' Capital Account, Units Issued					59,144
General Partners' Capital Account, Units Issued							32,197
Fair value of operating partnership units exceeding cost	$ 123,100	$ 114,900
Number of foreign currency tranches reported at fair value	2