Segment Reporting Operating Activity Within Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Operating income (loss)	$ 29,993	$ 30,384	$ 24,487	$ 28,821	$ 22,091	$ 27,275	$ 17,249	$ 12,920	$ 113,685	$ 79,535	$ 93,646
Total segments' profit									234,761	209,412	198,306
Total Retail
Segment Reporting Information [Line Items]
Property revenue									107,604	105,552	103,968
Property expense									(30,633)	(30,078)	(28,524)
Operating income (loss)									76,971	75,474	75,444
Total Office
Segment Reporting Information [Line Items]
Property revenue									144,683	112,362	105,694
Property expense									(42,234)	(33,860)	(33,120)
Operating income (loss)									102,449	78,502	72,574
Total Multifamily
Segment Reporting Information [Line Items]
Property revenue									51,066	50,627	43,533
Property expense									(20,863)	(20,441)	(17,898)
Operating income (loss)									30,203	30,186	25,635
Total Mixed-Use
Segment Reporting Information [Line Items]
Property revenue									63,388	62,326	61,788
Property expense									(38,250)	(37,076)	(37,135)
Operating income (loss)									$ 25,138	$ 25,250	$ 24,653