Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Nov. 06, 2014 Common Stock [Member]	Nov. 06, 2014 Restricted Stock [Member]
Document Information [Line Items]
Entity Registrant Name	KNOLL INC
Entity Central Index Key	0001011570
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		48,678,124	1,258,404