DEBT - Agreements (Detail)			1 Months Ended				12 Months Ended
	Sep. 01, 2015 USD ($) item	Apr. 01, 2015 USD ($)	May. 31, 2015 USD ($)	Sep. 30, 2014 USD ($) item	Aug. 31, 2013 USD ($)	Feb. 29, 2012 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Nov. 02, 2015 USD ($)
Debt
Pay-off of unsecured revolving line and term note							$ 487,000,000	$ 393,400,000
Accrued interest and unused commitment fee payable							1,688,000	967,000
Principal payments on, and estimated amortization of debt
2016							111,354,000
2017							4,642,000
2018							24,300,000
2019							1,519,000
2020							1,596,000
Thereafter							520,450,000
Total Debt							663,861,000
Unsecured revolving line of credit entered into February 2012 | CIM Urban Partners, L.P
Debt
Maximum borrowing capacity						$ 100,000,000
Unused commitment fee dependent upon amount of aggregate unused commitments, one (as a percent)					0.25%
Unused commitment fee dependent upon amount of aggregate unused commitments, two (as a percent)					0.35%
Unsecured revolving line of credit entered into February 2012 | CIM Urban Partners, L.P | Maximum
Debt
Interest rate margin (as a percent)						2.50%
Unsecured revolving line of credit entered into February 2012 | LIBOR | CIM Urban Partners, L.P | Minimum
Debt
Interest rate margin (as a percent)					1.25%	1.75%
Unsecured revolving line of credit entered into February 2012 | LIBOR | CIM Urban Partners, L.P | Maximum
Debt
Interest rate margin (as a percent)					1.85%
Unsecured revolving line of credit entered into August 2013 | CIM Urban Partners, L.P
Debt
Maximum borrowing capacity					$ 200,000,000
Unused commitment fee dependent upon amount of aggregate unused commitments, one (as a percent)					0.25%
Unused commitment fee dependent upon amount of aggregate unused commitments, two (as a percent)					0.35%
Unsecured revolving line of credit entered into August 2013 | LIBOR | CIM Urban Partners, L.P | Minimum
Debt
Interest rate margin (as a percent)					1.25%
Unsecured revolving line of credit entered into August 2013 | LIBOR | CIM Urban Partners, L.P | Maximum
Debt
Interest rate margin (as a percent)					1.85%
Mortgages Payable
Debt
Number of mortgages paid off | item	2
Repayments of debt	$ 58,873,000	$ 12,364,000
Principal payments on, and estimated amortization of debt
2016							4,354,000
2017							4,642,000
2018							24,300,000
2019							1,519,000
2020							1,596,000
Thereafter							108,380,000
Total Debt							144,791,000
Other debt
Principal payments on, and estimated amortization of debt
2016							107,000,000
Thereafter							412,070,000
Total Debt							519,070,000
Unsecured credit facility entered into in September 2014
Debt
Maximum borrowing capacity				$ 850,000,000
Amount outstanding under the facility							$ 450,000,000	$ 490,000,000
Period of extension option				1 year
Upsized borrowing capacity				$ 1,150,000,000
Number of extension | item				2
Interest rate (as a percent)							1.57%
Unsecured credit facility entered into in September 2014 | Minimum
Debt
Interest rate (as a percent)								1.31%
Unsecured credit facility entered into in September 2014 | Maximum
Debt
Interest rate (as a percent)								1.37%
Unsecured credit facility entered into in September 2014, revolver
Debt
Maximum borrowing capacity				$ 450,000,000
Amount outstanding under the facility							$ 0	$ 35,000,000
Unused commitment fee dependent upon amount of aggregate unused commitments, one (as a percent)				0.15%
Unused commitment fee dependent upon amount of aggregate unused commitments, two (as a percent)				0.25%
Principal payments on, and estimated amortization of debt
Unused line fee (as a percent)				0.25%
Unsecured credit facility entered into in September 2014, revolver | Base rate | Minimum
Debt
Interest rate margin (as a percent)				0.20%
Unsecured credit facility entered into in September 2014, revolver | Base rate | Maximum
Debt
Interest rate margin (as a percent)				1.00%
Unsecured credit facility entered into in September 2014, revolver | LIBOR | Minimum
Debt
Interest rate margin (as a percent)				1.20%
Unsecured credit facility entered into in September 2014, revolver | LIBOR | Maximum
Debt
Interest rate margin (as a percent)				2.00%
Unsecured credit facility entered into in September 2014, term loan
Debt
Maximum borrowing capacity				$ 325,000,000
Amount outstanding under the facility							$ 107,000,000	$ 325,000,000
Unsecured credit facility entered into in September 2014, term loan | Base rate | Minimum
Debt
Interest rate margin (as a percent)				0.15%
Unsecured credit facility entered into in September 2014, term loan | Base rate | Maximum
Debt
Interest rate margin (as a percent)				0.95%
Unsecured credit facility entered into in September 2014, term loan | LIBOR | Minimum
Debt
Interest rate margin (as a percent)				1.15%
Unsecured credit facility entered into in September 2014, term loan | LIBOR | Maximum
Debt
Interest rate margin (as a percent)				1.95%
Unsecured credit facility entered into in September 2014, delayed-draw term loan
Debt
Maximum borrowing capacity				$ 75,000,000
Unsecured term facility entered into in May 2015
Debt
Maximum borrowing capacity			$ 385,000,000
Unused commitment fee dependent upon amount of aggregate unused commitments, one (as a percent)			0.20%
Interest rate (as a percent)							1.84%
Prepayment fee			2.00%
Amount drawn under term loan									$ 385,000,000
Fixed interest rate (as a percent)							3.16%
Unsecured term facility entered into in May 2015 | Base rate | Minimum
Debt
Interest rate margin (as a percent)			0.60%
Unsecured term facility entered into in May 2015 | Base rate | Maximum
Debt
Interest rate margin (as a percent)			1.25%
Unsecured term facility entered into in May 2015 | LIBOR | Minimum
Debt
Interest rate margin (as a percent)			1.60%
Unsecured term facility entered into in May 2015 | LIBOR | Maximum
Debt
Interest rate margin (as a percent)			2.25%