Related Party Transactions and Investments in Non-Consolidated Entities (Details)	Sep. 30, 2012 entity	Sep. 30, 2011 entity
Related Party Transactions and Investments in Non-Consolidated Entities
Sponsored REITs (in entities)	16
Fully syndicated (in entities)	16
Not fully syndicated (in entities)		1
Number of REITs in which the entity holds non-controlling preferred stock interest	3