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RELATED-PARTY TRANSACTIONS (Details) - USD ($)				3 Months Ended		9 Months Ended
RELATED-PARTY TRANSACTIONS (Details) - USD ($)	Sep. 14, 2016	May 16, 2016	Oct. 01, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Mar. 11, 2014
Related-party transactions
Due to related parties				$ 9,664,000		$ 9,664,000		$ 9,472,000
Purchase price, repurchase of common stock						$ 290,134,000
Common Stock
Related-party transactions
Cash tender offer number of shares		10,000,000
Price per share of cash tender offer (in dollars per share)		$ 21.00
Repurchase of common stock (in shares)		10,000,000
Tender offer fees and expenses		$ 301,000
Purchase price		210,000,000
C I M Urban R E I T Management L P \| 0 - 500,000,000
Related-party transactions
Fee percentage				0.25%		0.25%
C I M Urban R E I T Management L P \| 0 - 500,000,000 \| Maximum
Related-party transactions
Daily average adjusted fair value of investments				$ 500,000,000		$ 500,000,000
C I M Urban R E I T Management L P \| 500,000,000 - 1,000,000,000
Related-party transactions
Fee percentage				0.2375%		0.2375%
C I M Urban R E I T Management L P \| 500,000,000 - 1,000,000,000 \| Minimum
Related-party transactions
Daily average adjusted fair value of investments				$ 500,000,000		$ 500,000,000
C I M Urban R E I T Management L P \| 500,000,000 - 1,000,000,000 \| Maximum
Related-party transactions
Daily average adjusted fair value of investments				$ 1,000,000,000		$ 1,000,000,000
C I M Urban R E I T Management L P \| 1,000,000,000 - 1,500,000,000
Related-party transactions
Fee percentage				0.225%		0.225%
C I M Urban R E I T Management L P \| 1,000,000,000 - 1,500,000,000 \| Minimum
Related-party transactions
Daily average adjusted fair value of investments				$ 1,000,000,000		$ 1,000,000,000
C I M Urban R E I T Management L P \| 1,000,000,000 - 1,500,000,000 \| Maximum
Related-party transactions
Daily average adjusted fair value of investments				$ 1,500,000,000		$ 1,500,000,000
C I M Urban R E I T Management L P \| 1,500,000,000 - 4,000,000,000
Related-party transactions
Fee percentage				0.2125%		0.2125%
C I M Urban R E I T Management L P \| 1,500,000,000 - 4,000,000,000 \| Minimum
Related-party transactions
Daily average adjusted fair value of investments				$ 1,500,000,000		$ 1,500,000,000
C I M Urban R E I T Management L P \| 1,500,000,000 - 4,000,000,000 \| Maximum
Related-party transactions
Daily average adjusted fair value of investments				$ 4,000,000,000		$ 4,000,000,000
C I M Urban R E I T Management L P \| 4,000,000,000 - 20,000,000,000
Related-party transactions
Fee percentage				0.10%		0.10%
C I M Urban R E I T Management L P \| 4,000,000,000 - 20,000,000,000 \| Minimum
Related-party transactions
Daily average adjusted fair value of investments				$ 4,000,000,000		$ 4,000,000,000
C I M Urban R E I T Management L P \| 4,000,000,000 - 20,000,000,000 \| Maximum
Related-party transactions
Daily average adjusted fair value of investments				20,000,000,000		20,000,000,000
C I M Urban R E I T Management L P \| Asset management fees
Related-party transactions
Fees				6,589,000	$ 6,259,000	19,305,000	$ 18,577,000
Due to related parties				6,360,000		6,360,000		6,260,000
C I M Urban R E I T Management L P \| Property management
Related-party transactions
Fees				1,443,000	1,446,000	4,258,000	4,372,000
C I M Management Entities
Related-party transactions
Due to related parties				2,747,000		2,747,000		2,230,000
Leasing commissions				397,000	217,000	1,151,000	310,000
C I M Management Entities \| Personnel
Related-party transactions
Fees				2,301,000	2,016,000	6,308,000	6,302,000
C I M Management Entities \| Construction management fees
Related-party transactions
Fees				119,000	218,000	787,000	665,000
C I M Management Entities And Related Parties
Related-party transactions
Due from related parties				(690,000)		(690,000)		(274,000)
C I M Service Provider L L C \| Master Services Agreement
Related-party transactions
Due to related parties				1,247,000		1,247,000		$ 1,256,000
Fees payable per year under agreement									$ 1,000,000
Compensation expensed for performing other services				676,000	654,000	2,402,000	2,244,000
C I M Service Provider L L C \| Base Service Fee
Related-party transactions
Fees				259,000	253,000	784,000	759,000
Cim Sba Staffing Llc \| Personnel
Related-party transactions
Personnel expenses				137,000	72,000	417,000	596,000
Fees for services deferred				40,000	53,000	189,000	194,000
Cim Sba Staffing Llc \| Expenses related to lending segment subject to reimbursement
Related-party transactions
Fees				865,000	1,109,000	2,679,000	2,821,000
Cim Sba Staffing Llc \| Expenses related to corporate services subject to reimbursement
Related-party transactions
Fees				107,000	124,000	333,000	375,000
Cim Management Entities Affiliate
Related-party transactions
Lease renewal term			5 years
Revenue from related parties				$ 27,000	$ 26,000	$ 81,000	$ 78,000
Urban Partners II, LLC \| Common Stock
Related-party transactions
Repurchase of common stock (in shares)	3,628,116
Purchase price		$ 208,140,000
Purchase price, repurchase of common stock	$ 79,819,000
Share price of stock repurchased (in usd per share)	$ 22.00