Schedule III-REAL ESTATE AND ACCUMULATE DEPRECIATION (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Real Estate Assets
Balance, beginning of period	$ 1,953,848us-gaap_RealEstateGrossAtCarryingValue	$ 1,907,903us-gaap_RealEstateGrossAtCarryingValue	$ 1,895,128us-gaap_RealEstateGrossAtCarryingValue
Additions
Property acquisitions	63,528	38,835
Improvements	28,879us-gaap_RealEstateImprovements	24,520us-gaap_RealEstateImprovements	25,470us-gaap_RealEstateImprovements
Deductions: retirements	(9,461)cmct_ScheduleIiiRealEstateRetirements	(17,410)cmct_ScheduleIiiRealEstateRetirements	(12,695)cmct_ScheduleIiiRealEstateRetirements
Balance, end of period	2,036,794us-gaap_RealEstateGrossAtCarryingValue	1,953,848us-gaap_RealEstateGrossAtCarryingValue	1,907,903us-gaap_RealEstateGrossAtCarryingValue
Accumulated Depreciation
Balance, beginning of period	(271,683)	(231,080)	(184,626)
Additions: Depreciation	(58,635)	(58,013)	(59,149)
Deductions: retirements	9,461	17,410	12,695
Balance, end of period	$ (320,857)	$ (271,683)	$ (231,080)

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Amount of retirements to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

No definition available.

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Amount of decrease to accumulated depreciation for real estate investments retirements for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

No definition available.

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- Definition

Amount of increase in real estate investments from acquisitions for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

No definition available.

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- Definition

Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 970

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28.FN4)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule III)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

-Article 5

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- Definition

Amount, before accumulated depreciation, of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule III)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 970

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28.4)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

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- Definition

Amount of increase in real estate investments related to improvements for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

+ Details

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- Definition

Amount of depreciation expense of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

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