Variable Interest Entities - Summarized Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Assets:
Net Investment in Real Estate	$ 2,568,716	$ 2,502,638
Total Assets	2,767,563	2,709,808
Liabilities and Partners' Capital:
Mortgage Loans Payable, Net	500,176	561,241
Total Liabilities and Equity/Partners' Capital	2,767,563	2,709,808
Other Real Estate Partnerships
Assets:
Net Investment in Real Estate	291,198	306,866
Other Assets, Net	22,406	20,104
Total Assets	313,604	326,970
Liabilities and Partners' Capital:
Mortgage Loans Payable, Net	70,734	77,071
Other Liabilities, Net	32,221	43,103
Partners’ Capital	210,649	206,796
Total Liabilities and Equity/Partners' Capital	$ 313,604	$ 326,970