Investments in and Advances to Joint Ventures - Condensed Combined Financial Information of Company's Unconsolidated Joint Venture Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Condensed Combined Balance Sheets
Land	$ 857,782	$ 873,548
Buildings	3,209,229	3,251,030
Fixtures and tenant improvements	466,394	448,371
Total real estate rental property	4,533,405	4,572,949
Less: Accumulated depreciation	(1,255,110)	(1,172,357)
Real estate rental property, net	3,278,295	3,400,592
Construction in progress and land	76,525	54,917
Total real estate assets, net	3,354,820	3,455,509
Other assets, net	120,816	116,229
Total assets	4,099,861	4,206,331
Mortgage debt	86,392	88,743
Total liabilities	2,092,356	2,133,329
Total liabilities and equity	4,099,861	4,206,331
Company's share of accumulated equity	172,567	145,786
Redeemable preferred equity, net	162,730	189,891
Basis differentials	(8,114)	(8,536)
Deferred development fees, net of portion related to the Company's interest	(2,409)	(2,700)
Amounts payable to the Company	6,105	5,182
Investments in and Advances to Joint Ventures, net	330,879	329,623
Unconsolidated Joint Ventures [Member]
Condensed Combined Balance Sheets
Land	957,434	1,004,289
Buildings	2,710,289	2,804,027
Fixtures and tenant improvements	230,656	221,412
Total real estate rental property	3,898,379	4,029,728
Less: Accumulated depreciation	(968,414)	(935,921)
Real estate rental property, net	2,929,965	3,093,807
Construction in progress and land	54,198	56,498
Total real estate assets, net	2,984,163	3,150,305
Cash and restricted cash	88,934	94,111
Receivables, net	39,820	44,702
Other assets, net	164,641	186,693
Total assets	3,277,558	3,475,811
Mortgage debt	1,844,940	2,212,503
Notes and accrued interest payable to the Company	6,105	5,182
Other liabilities	153,788	161,372
Total liabilities	2,004,833	2,379,057
Redeemable preferred equity – SITE Centers	263,316	274,493
Accumulated equity	1,009,409	822,261
Total liabilities and equity	$ 3,277,558	$ 3,475,811