ACQUISITION - Pro forma Summary Financial Information (Details) (Holly Hunt Enterprises, Inc [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014
Holly Hunt Enterprises, Inc [Member]
Business Acquisition, Pro Forma Information [Abstract]
Pro forma net sales	$ 237,422
Pro forma net earnings attributable to Knoll, Inc stockholders	$ 8,252

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

Name:	us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration