Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2012	Mar. 05, 2013	Jun. 29, 2012
Document And Entity Information
Entity Registrant Name	Capital Trust Inc
Entity Central Index Key	0001061630
Document Type	10-K
Document Period End Date	Dec. 31, 2012
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Is Entity's Reporting Status Current?	Yes
Well-known seasoned issuer?	No
Entity Voluntary Filers?	No
Entity Filer Category	Smaller Reporting Company
Entity Public Float			$ 47,936,520
Entity Common Stock, Shares Outstanding		29,266,514
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2012