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Acquisitions and Dispositions - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013 Trust Investment	Sep. 30, 2012
Business Combinations [Abstract]
Number of limited partnerships	18
Number of business income trusts	2
Purchase of non-controlling interests	$ 14,000	$ 66,000

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- Definition

Number of business income trusts.

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- Definition

Number of limited partnerships.

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- Definition

Repurchase interests of partners and trust unit holders.

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- Details

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