Investments in and Advances to Joint Ventures - Condensed Combined Financial Information of Company's Unconsolidated Joint Venture Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Condensed Combined Balance Sheets
Land	$ 2,187,720	$ 2,208,468
Buildings	6,931,911	7,087,040
Fixtures and tenant improvements	709,548	645,035
Total real estate rental property	9,829,179	9,940,543
Less: Accumulated depreciation	(2,038,635)	(1,909,585)
Real estate rental property, net	7,790,544	8,030,958
Land held for development and construction in progress	326,196	395,242
Total real estate assets, net	8,116,740	8,426,200
Other assets	375,299	451,442
Total assets	9,155,479	9,541,895
Mortgage debt	1,209,921	1,689,805
Total liabilities	5,717,143	5,744,367
Total liabilities and equity	9,155,479	9,541,895
Company's share of accumulated equity	125,103	122,937
Redeemable preferred equity	310,763	305,310
Basis differentials	(42,803)	(12,954)
Deferred development fees, net of portion related to the Company's interest	(2,469)	(2,562)
Amounts payable to the Company	2,926	2,117
Investments in and Advances to Joint Ventures	393,520	414,848
Unconsolidated Joint Ventures [Member]
Condensed Combined Balance Sheets
Land	1,319,519	1,439,849
Buildings	3,457,212	3,854,585
Fixtures and tenant improvements	183,108	200,696
Total real estate rental property	4,959,839	5,495,130
Less: Accumulated depreciation	(799,161)	(773,256)
Real estate rental property, net	4,160,678	4,721,874
Land held for development and construction in progress	52,215	55,698
Total real estate assets, net	4,212,893	4,777,572
Cash and restricted cash	62,751	100,812
Receivables, net	52,903	80,508
Other assets	299,625	394,751
Total assets	4,628,172	5,353,643
Mortgage debt	3,116,584	3,552,764
Notes and accrued interest payable to the Company	2,926	144,831
Other liabilities	198,804	276,998
Total liabilities	3,318,314	3,974,593
Redeemable preferred equity	310,763	305,310
Accumulated equity	999,095	1,073,740
Total liabilities and equity	$ 4,628,172	$ 5,353,643