ACQUISITIONS - Pro forma Summary Financial Information (Details) - Holly Hunt Enterprises, Inc $ in Thousands	6 Months Ended
Jun. 30, 2014 USD ($)
Business Acquisition, Pro Forma Information [Abstract]
Pro forma net sales	$ 503,365
Pro forma net earnings attributable to Knoll, Inc stockholders	$ 19,106

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

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Balance Type:	credit
Period Type:	duration