Investments in and Advances to Joint Ventures - Condensed Combined Financial Information of Company's Unconsolidated Joint Venture Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Condensed Combined Balance Sheets
Land	$ 1,700,502	$ 1,738,792
Buildings	5,599,708	5,733,451
Fixtures and tenant improvements	696,787	693,280
Total real estate rental property	7,996,997	8,165,523
Less: Accumulated depreciation	(1,963,427)	(1,953,479)
Real estate rental property, net	6,033,570	6,212,044
Construction in progress and land	77,033	82,480
Total real estate assets, net	6,110,603	6,294,524
Other assets, net	214,681	210,059
Total assets	6,910,446	7,170,073
Mortgage debt	1,505,235	641,082
Total liabilities	4,138,123	4,272,635
Total liabilities and equity	6,910,446	7,170,073
Company's share of accumulated equity	122,593	132,710
Redeemable preferred equity, net	236,925	277,776
Basis differentials	(25,422)	(24,973)
Deferred development fees, net of portion related to the Company's interest	(2,963)	(3,065)
Amounts payable to the Company	2,526	1,365
Investments in and Advances to Joint Ventures, net	333,659	383,813
Unconsolidated Joint Ventures [Member]
Condensed Combined Balance Sheets
Land	1,066,607	1,126,703
Buildings	2,923,406	3,057,072
Fixtures and tenant improvements	211,327	213,989
Total real estate rental property	4,201,340	4,397,764
Less: Accumulated depreciation	(949,879)	(962,038)
Real estate rental property, net	3,251,461	3,435,726
Construction in progress and land	52,417	53,928
Total real estate assets, net	3,303,878	3,489,654
Cash and restricted cash	73,828	155,894
Receivables, net	43,289	51,396
Other assets, net	164,029	174,832
Total assets	3,585,024	3,871,776
Mortgage debt	2,357,965	2,501,163
Notes and accrued interest payable to the Company	2,526	1,365
Other liabilities	145,259	156,076
Total liabilities	2,505,750	2,658,604
Redeemable preferred equity – DDR	309,744	345,149
Accumulated equity	769,530	868,023
Total liabilities and equity	$ 3,585,024	$ 3,871,776