EQUITY (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Change in equity attributable to Knoll, Inc. stockholders and noncontrolling interests:
Balance, as of December 31, 2014	$ 213,218
Total comprehensive income:
Net earnings (loss) attributable to Knoll, Inc. stockholders and noncontrolling interests	17,435
Other comprehensive income	(11,617)	(3,755)
Other changes in equity:
Purchase of common stock for treasury	(6,067)
Cash dividends declared	(5,985)
Proceeds from the issuance of common stock	3,826
Stock-based compensation	1,385
Excess tax benefit from the exercise of stock options, vesting of equity awards	658
Balance, as of March 31, 2015	212,853
Equity Attributable to Knoll Inc., Stockholders
Change in equity attributable to Knoll, Inc. stockholders and noncontrolling interests:
Balance, as of December 31, 2014	213,011
Total comprehensive income:
Net earnings (loss) attributable to Knoll, Inc. stockholders and noncontrolling interests	17,443
Other comprehensive income	(11,617)
Other changes in equity:
Purchase of common stock for treasury	(6,067)
Cash dividends declared	(5,985)
Proceeds from the issuance of common stock	3,826
Stock-based compensation	1,385
Excess tax benefit from the exercise of stock options, vesting of equity awards	658
Balance, as of March 31, 2015	212,654
Noncontrolling Interests
Change in equity attributable to Knoll, Inc. stockholders and noncontrolling interests:
Balance, as of December 31, 2014	207
Total comprehensive income:
Net earnings (loss) attributable to Knoll, Inc. stockholders and noncontrolling interests	(8)
Other comprehensive income	0
Other changes in equity:
Purchase of common stock for treasury	0
Cash dividends declared	0
Proceeds from the issuance of common stock	0
Stock-based compensation	0
Excess tax benefit from the exercise of stock options, vesting of equity awards	0
Balance, as of March 31, 2015	$ 199