EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 255,474
Net earnings			38,573
Other comprehensive income	$ 1,430	$ 1,500	5,344	$ (10,117)
Exercise of stock options (165,000 shares)			2,072
Income tax effect from the exercise of stock options and vesting of equity awards			662
Shares issued under stock incentive plan (297,632)			0
Shares issued to Board of Directors in lieu of cash (2,182 shares)			50
Stock-based compensation			4,592
Cash dividend ($0.30 per share)			(14,930)
Purchase of common stock (188,169 shares)			(3,903)
Ending Balance	287,934		$ 287,934
Exercise of stock options (in shares)			165,000
Shares issued to Board of Directors in lieu of cash (in shares)			2,182
Cash dividend (in dollars per share)			$ 0.30
Purchase of common stock (in shares)			188,169
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 488
Exercise of stock options (165,000 shares)			2
Shares issued under stock incentive plan (297,632)			3
Purchase of common stock (188,169 shares)			(2)
Ending Balance	491		$ 491
Shares issued under stock incentive plan (in shares)			297,632
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 47,165
Exercise of stock options (165,000 shares)			2,070
Income tax effect from the exercise of stock options and vesting of equity awards			662
Shares issued under stock incentive plan (297,632)			(3)
Shares issued to Board of Directors in lieu of cash (2,182 shares)			50
Stock-based compensation			4,592
Purchase of common stock (188,169 shares)			(3,901)
Ending Balance	50,635		50,635
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			244,947
Net earnings			38,556
Cash dividend ($0.30 per share)			(14,930)
Ending Balance	268,573		268,573
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			(37,318)
Other comprehensive income			5,344
Ending Balance	(31,974)		(31,974)
Total Knoll, Inc. Stockholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			255,282
Net earnings			38,556
Other comprehensive income			5,344
Exercise of stock options (165,000 shares)			2,072
Income tax effect from the exercise of stock options and vesting of equity awards			662
Shares issued under stock incentive plan (297,632)			0
Shares issued to Board of Directors in lieu of cash (2,182 shares)			50
Stock-based compensation			4,592
Cash dividend ($0.30 per share)			(14,930)
Purchase of common stock (188,169 shares)			(3,903)
Ending Balance	287,725		287,725
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			192
Net earnings			17
Other comprehensive income			0
Exercise of stock options (165,000 shares)			0
Income tax effect from the exercise of stock options and vesting of equity awards			0
Shares issued under stock incentive plan (297,632)			0
Shares issued to Board of Directors in lieu of cash (2,182 shares)			0
Stock-based compensation			0
Cash dividend ($0.30 per share)			0
Purchase of common stock (188,169 shares)			0
Ending Balance	$ 209		$ 209