Variable Interest Entities - Condensed Balance Sheet (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets:
Net Investment in Real Estate	$ 2,543,231	$ 2,502,638
Total Assets	2,732,419	2,709,808
Liabilities and Partners' Capital:
Mortgage Loans Payable, Net	505,451	561,241
Total Liabilities and Equity/Partners' Capital	2,732,419	2,709,808
Other Real Estate Partnerships
Assets:
Net Investment in Real Estate	304,246	306,866
Other Assets, Net	20,524	20,104
Total Assets	324,770	326,970
Liabilities and Partners' Capital:
Mortgage Loans Payable, Net	71,415	77,071
Other Liabilities, Net	38,404	43,103
Partners’ Capital	214,951	206,796
Total Liabilities and Equity/Partners' Capital	$ 324,770	$ 326,970