EQUITY (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Change in equity attributable to Knoll, Inc. stockholders and noncontrolling interests:
Balance, as of December 31, 2013	$ 228,442
Noncontrolling interest recognized in the acquisition of HOLLY HUNT®	218
Total comprehensive income:
Net earnings attributable to Knoll, Inc. stockholders and noncontrolling interest	8,192
Pension and other post-retirement liability adjustment	64	956
Foreign currency translation adjustment	(3,819)	(2,525)
Total other comprehensive income (loss), net of tax	(3,755)	(1,569)
Total comprehensive income	4,437	4,505
Other changes in equity:
Purchase of treasury stock	(3,691)
Cash dividends - common stock ($0.12 per share)	(5,679)
Other, including activity related to equity awards	470
Balance, as of March 31, 2014	224,197
Cash dividend (in dollars per share)	$ 120
Equity Attributable to Knoll Inc., Stockholders [Member]
Change in equity attributable to Knoll, Inc. stockholders and noncontrolling interests:
Balance, as of December 31, 2013	228,442
Noncontrolling interest recognized in the acquisition of HOLLY HUNT®	0
Total comprehensive income:
Net earnings attributable to Knoll, Inc. stockholders and noncontrolling interest	8,186
Pension and other post-retirement liability adjustment	64
Foreign currency translation adjustment	(3,819)
Total other comprehensive income (loss), net of tax	(3,755)
Total comprehensive income	4,431
Other changes in equity:
Purchase of treasury stock	(3,691)
Cash dividends - common stock ($0.12 per share)	(5,679)
Other, including activity related to equity awards	470
Balance, as of March 31, 2014	223,973
Noncontrolling Interests [Member]
Change in equity attributable to Knoll, Inc. stockholders and noncontrolling interests:
Balance, as of December 31, 2013	0
Noncontrolling interest recognized in the acquisition of HOLLY HUNT®	218
Total comprehensive income:
Net earnings attributable to Knoll, Inc. stockholders and noncontrolling interest	6
Pension and other post-retirement liability adjustment	0
Foreign currency translation adjustment	0
Total other comprehensive income (loss), net of tax	0
Total comprehensive income	6
Other changes in equity:
Purchase of treasury stock
Cash dividends - common stock ($0.12 per share)
Other, including activity related to equity awards	0
Balance, as of March 31, 2014	$ 224