Document and Entity Information	3 Months Ended
	Mar. 31, 2012	Apr. 18, 2012
Document And Entity Information
Entity Registrant Name	Capital Trust Inc
Entity Central Index Key	0001061630
Document Type	10-Q
Document Period End Date	Mar. 31, 2012
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Is Entity a Well-known Seasoned Issuer?	No
Is Entity a Voluntary Filer?	No
Is Entity's Reporting Status Current?	Yes
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		22,245,517
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2012