Summary of Disposition and Each Property's Contribution (Detail) - USD ($) $ in Thousands					3 Months Ended		9 Months Ended
		Sep. 29, 2017	Jun. 30, 2017	May 24, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Real Estate Properties [Line Items]
Net income (loss) allocable to common shares					$ (24,230)	$ (4)	$ (180,072)	$ (25,428)
Multifamily properties | South Terrace
Real Estate Properties [Line Items]
Gain (loss) on sale			$ 9,189
Retail real estate properties | South Plaza
Real Estate Properties [Line Items]
Gain (loss) on sale		$ 166		$ 1,481
Disposal Group Held For Sale Or Disposed Of By Sale Not Discontinued Operations
Real Estate Properties [Line Items]
Sale Price							191,278
Gain (loss) on sale							19,693
Net income (loss) allocable to common shares					473		$ 1,935
Disposal Group Held For Sale Or Disposed Of By Sale Not Discontinued Operations | Multifamily properties | Tuscany Bay
Real Estate Properties [Line Items]
Date of Sale							Jan. 06, 2017
Sale Price							$ 36,650
Gain (loss) on sale							7,657
Net income (loss) allocable to common shares							$ 2
Disposal Group Held For Sale Or Disposed Of By Sale Not Discontinued Operations | Multifamily properties | Emerald Bay
Real Estate Properties [Line Items]
Date of Sale	[1]						Mar. 08, 2017
Sale Price	[1]						$ 23,750
Gain (loss) on sale	[1]						772
Net income (loss) allocable to common shares	[1]						$ 135
Disposal Group Held For Sale Or Disposed Of By Sale Not Discontinued Operations | Multifamily properties | Oyster Point
Real Estate Properties [Line Items]
Date of Sale	[1]						Mar. 28, 2017
Sale Price	[1]						$ 11,500
Gain (loss) on sale	[1]						(82)
Net income (loss) allocable to common shares	[1]				1		$ (13)
Disposal Group Held For Sale Or Disposed Of By Sale Not Discontinued Operations | Multifamily properties | South Terrace
Real Estate Properties [Line Items]
Date of Sale							Jun. 30, 2017
Sale Price							$ 42,950
Gain (loss) on sale							9,189
Net income (loss) allocable to common shares					(58)		$ 261
Disposal Group Held For Sale Or Disposed Of By Sale Not Discontinued Operations | Multifamily properties | Trails at Northpointe
Real Estate Properties [Line Items]
Date of Sale	[1]						Jul. 18, 2017
Sale Price	[1]						$ 6,450
Gain (loss) on sale	[1]						(54)
Net income (loss) allocable to common shares	[1]				(39)		$ 7
Disposal Group Held For Sale Or Disposed Of By Sale Not Discontinued Operations | Office | Tiffany Square
Real Estate Properties [Line Items]
Date of Sale	[1]						Mar. 09, 2017
Sale Price	[1]						$ 12,175
Gain (loss) on sale	[1]						113
Net income (loss) allocable to common shares	[1]				(5)		$ 59
Disposal Group Held For Sale Or Disposed Of By Sale Not Discontinued Operations | Office | Executive Center
Real Estate Properties [Line Items]
Date of Sale							Mar. 31, 2017
Sale Price							$ 10,600
Gain (loss) on sale							437
Net income (loss) allocable to common shares					2		$ 123
Disposal Group Held For Sale Or Disposed Of By Sale Not Discontinued Operations | Office | 100 E. Lancaster
Real Estate Properties [Line Items]
Date of Sale	[1]						Apr. 13, 2017
Sale Price	[1]						$ 4,575
Gain (loss) on sale	[1]						14
Net income (loss) allocable to common shares	[1]				(6)		$ 70
Disposal Group Held For Sale Or Disposed Of By Sale Not Discontinued Operations | Office | UBS Tower
Real Estate Properties [Line Items]
Date of Sale	[1]						May 09, 2017
Sale Price	[1]						$ 14,150
Net income (loss) allocable to common shares	[1]				(4)		$ (43)
Disposal Group Held For Sale Or Disposed Of By Sale Not Discontinued Operations | Office | Rutherford
Real Estate Properties [Line Items]
Date of Sale	[1]						Sep. 29, 2017
Sale Price	[1]						$ 5,700
Net income (loss) allocable to common shares	[1]				127		436
Disposal Group Held For Sale Or Disposed Of By Sale Not Discontinued Operations | Retail real estate properties | South Plaza
Real Estate Properties [Line Items]
Sale Price	[2]						22,478
Gain (loss) on sale	[2]						1,647
Net income (loss) allocable to common shares	[2]				$ 455		$ 898
Disposal Group Held For Sale Or Disposed Of By Sale Not Discontinued Operations | Land | MGS
Real Estate Properties [Line Items]
Date of Sale	[1]						Mar. 31, 2017
Sale Price	[1]						$ 300
Disposal Group Held For Sale Or Disposed Of By Sale Not Discontinued Operations | South Plaza Property One | Retail real estate properties | South Plaza
Real Estate Properties [Line Items]
Date of Sale	[1]						May 24, 2017
Disposal Group Held For Sale Or Disposed Of By Sale Not Discontinued Operations | South Plaza Property Two | Retail real estate properties | South Plaza
Real Estate Properties [Line Items]
Date of Sale	[1]						Sep. 29, 2017

[1] These properties were previously impaired.

[2] Includes gain on sale in May and September 2017 of $1,481 and $166, respectively.