Summary of the Financial Position of the Entities Accounted for Using the Equity Method (Detail) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Assets:
Real estate, net	$ 1,503,160	$ 1,393,274
Other assets	52,622	67,278
Total assets	1,555,782	1,460,552
Liabilities and partners' capital:
Mortgage notes payable and credit facility	1,072,660	965,931
Other liabilities	26,901	24,835
Partners' capital	456,221	469,786
Total liabilities and partners' capital	$ 1,555,782	$ 1,460,552