Document and Entity Information	9 Months Ended
	Sep. 30, 2012	Nov. 09, 2012
Document And Entity Information
Entity Registrant Name	Capital Trust Inc
Entity Central Index Key	0001061630
Document Type	10-Q
Document Period End Date	Sep. 30, 2012
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Is Entity's Reporting Status Current?	Yes
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		24,205,573
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2012