EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	$ 255,474
Net earnings	17,270
Other comprehensive income	4,187	$ (11,617)
Exercise of stock options (33,583 shares)	374
Income tax effect from the exercise of stock options and vesting of equity awards	141
Shares issued under stock incentive plan	0
Shares issued to Board of Directors in lieu of cash (1,154 shares)	25
Stock-based compensation (117,500 shares)	2,138
Cash dividend ($0.15 per share)	(7,461)
Purchase of common stock (12,569 shares)	(1,903)
Balance	$ 270,245
Exercise of stock options (in shares)	33,583
Shares issued to Board of Directors in lieu of cash (in shares)	1,154
Stock-based compensation (in shares)	0
Cash dividend (in dollars per share)	$ 0.15
Purchase of common stock (in shares)	104,261
Sales to clients attributed to the geographic areas based on the origin of sale
Sales	$ 284,629	$ 266,498
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	488
Shares issued under stock incentive plan	3
Purchase of common stock (12,569 shares)	(1)
Balance	490
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	47,165
Exercise of stock options (33,583 shares)	374
Income tax effect from the exercise of stock options and vesting of equity awards	141
Shares issued under stock incentive plan	(3)
Shares issued to Board of Directors in lieu of cash (1,154 shares)	25
Stock-based compensation (117,500 shares)	2,138
Purchase of common stock (12,569 shares)	(1,902)
Balance	47,938
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	244,947
Net earnings	17,259
Cash dividend ($0.15 per share)	(7,461)
Balance	254,745
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	(37,318)
Other comprehensive income	4,187
Balance	(33,131)
Total Knoll, Inc. Stockholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	255,282
Net earnings	17,259
Other comprehensive income	4,187
Exercise of stock options (33,583 shares)	374
Income tax effect from the exercise of stock options and vesting of equity awards	141
Shares issued under stock incentive plan	0
Shares issued to Board of Directors in lieu of cash (1,154 shares)	25
Stock-based compensation (117,500 shares)	2,138
Cash dividend ($0.15 per share)	(7,461)
Purchase of common stock (12,569 shares)	(1,903)
Balance	270,042
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	192
Net earnings	11
Other comprehensive income	0
Exercise of stock options (33,583 shares)	0
Income tax effect from the exercise of stock options and vesting of equity awards	0
Shares issued under stock incentive plan	0
Shares issued to Board of Directors in lieu of cash (1,154 shares)	0
Stock-based compensation (117,500 shares)	0
Cash dividend ($0.15 per share)	0
Purchase of common stock (12,569 shares)	0
Balance	$ 203