Document And Entity Information	3 Months Ended
	Mar. 31, 2015	May 06, 2015
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Entity Registrant Name	ENZON PHARMACEUTICALS INC
Entity Central Index Key	0000727510
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Trading Symbol	ENZN
Entity Common Stock, Shares Outstanding		44,182,407