Investments in Unconsolidated Joint Ventures - Financial Results (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets:
Property, net	$ 9,052,105	$ 9,176,642
Other assets	635,838	614,607
Total assets	9,687,943	9,791,249
Liabilities and partners' capital:
Mortgage and other notes payable	5,296,594	5,224,713
Other liabilities	405,052	403,369
Company's capital	2,188,057	2,279,819
Outside partners' capital	1,798,240	1,883,348
Total liabilities and partners' capital	9,687,943	9,791,249
Investment in unconsolidated joint ventures:
Company's capital	2,188,057	2,279,819
Basis adjustment	(562,021)	(584,887)
Investments in unconsolidated joint ventures	1,626,036	1,694,932
Assets—Investments in unconsolidated joint ventures	1,709,522	1,773,558
Liabilities—Distributions in excess of investments in unconsolidated joint ventures	(83,486)	(78,626)
Investments in unconsolidated joint ventures	1,626,036	1,694,932
Total assets	9,687,943	9,791,249
Amortization of difference between cost of investments and book value of underlying equity	16,562	17,610	$ 5,619
Revenues:
Minimum rents	636,182	600,284	315,093
Percentage rents	18,916	20,917	15,757
Tenant recoveries	235,634	235,144	137,467
Other	57,726	56,240	35,113
Total revenues	948,458	912,585	503,430
Expenses:
Shopping center and operating expenses	284,611	274,508	172,647
Interest expense	198,767	187,669	88,727
Depreciation and amortization	352,546	360,378	150,626
Total operating expenses	835,924	822,555	412,000
(Loss) gain on sale of assets	33,825	(375)	9,850
Loss on extinguishment of debt			(3)
Net (loss) income	146,359	89,655	101,277
Company's equity in net (loss) income	85,546	56,941	45,164
Pacific Premier Retail LP
Revenues:
Minimum rents	134,450	129,145	21,172
Percentage rents	5,050	5,437	2,569
Tenant recoveries	46,575	47,856	8,408
Other	5,959	6,303	1,182
Total revenues	192,034	188,741	33,331
Expenses:
Shopping center and operating expenses	41,340	39,804	6,852
Interest expense	67,053	64,626	10,448
Depreciation and amortization	101,625	108,880	16,919
Total operating expenses	210,018	213,310	34,219
(Loss) gain on sale of assets	(36)	0	0
Loss on extinguishment of debt			0
Net (loss) income	(18,020)	(24,569)	(888)
Company's equity in net (loss) income	(453)	(3,088)	1,409
Other Joint Ventures
Revenues:
Minimum rents	501,732	471,139	293,921
Percentage rents	13,866	15,480	13,188
Tenant recoveries	189,059	187,288	129,059
Other	51,767	49,937	33,931
Total revenues	756,424	723,844	470,099
Expenses:
Shopping center and operating expenses	243,271	234,704	165,795
Interest expense	131,714	123,043	78,279
Depreciation and amortization	250,921	251,498	133,707
Total operating expenses	625,906	609,245	377,781
(Loss) gain on sale of assets	33,861	(375)	9,850
Loss on extinguishment of debt			(3)
Net (loss) income	164,379	114,224	102,165
Company's equity in net (loss) income	85,999	60,029	43,755
Northwestern Mutual Life (NML)
Investment in unconsolidated joint ventures:
Mortgage notes payable to affiliate	482,332	265,863
Interest expense on borrowings from related party	17,898	16,898	$ 29,372
Pacific Premier Retail LLC—Various Properties
Assets:
Total assets	3,106,105	3,179,255
Investment in unconsolidated joint ventures:
Total assets	3,106,105	3,179,255
Total liabilities	$ 1,872,227	$ 1,887,952