Investments in and Advances to Joint Ventures - Condensed Combined Financial Information of Company's Unconsolidated Joint Venture Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Condensed Combined Balance Sheets
Land	$ 947,411	$ 953,556
Buildings	3,479,583	3,488,499
Fixtures and tenant improvements	519,550	509,866
Total real estate rental property	4,946,544	4,951,921
Less: Accumulated depreciation	(1,463,598)	(1,427,057)
Real estate rental property, net	3,482,946	3,524,864
Construction in progress and land	38,004	37,467
Total real estate assets, net	3,520,950	3,562,331
Other assets, net	130,952	130,690
Total assets	4,175,380	4,108,284
Mortgage debt	230,632	249,260
Total liabilities	2,003,776	2,163,461
Accumulated equity	2,171,604	1,944,823	$ 1,967,478	$ 1,981,478
Total liabilities and equity	4,175,380	4,108,284
Company's share of accumulated equity	66,852	72,555
Basis differentials	5,652	1,644
Deferred development fees, net of portion related to the Company's interest	(1,229)	(1,277)
Amounts payable to the Company	4,707	4,375
Investments in and Advances to Joint Ventures, net	75,982	77,297
Unconsolidated Joint Ventures [Member]
Condensed Combined Balance Sheets
Land	441,412	441,412
Buildings	1,259,441	1,258,879
Fixtures and tenant improvements	143,736	137,663
Total real estate rental property	1,844,589	1,837,954
Less: Accumulated depreciation	(504,904)	(492,288)
Real estate rental property, net	1,339,685	1,345,666
Construction in progress and land	2,506	58,201
Total real estate assets, net	1,342,191	1,403,867
Cash and restricted cash	47,258	35,212
Receivables, net	20,336	25,719
Other assets, net	62,116	61,381
Total assets	1,471,901	1,526,179
Mortgage debt	1,029,240	1,029,579
Notes and accrued interest payable to the Company	4,707	4,375
Other liabilities	58,888	57,349
Total liabilities	1,092,835	1,091,303
Accumulated equity	379,066	434,876
Total liabilities and equity	$ 1,471,901	$ 1,526,179