CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total Knoll, Inc. Stockholders' Equity	Noncontrolling Interests
Beginning Balance at Dec. 31, 2014	$ 213,218	$ 487	$ 41,143	$ 204,063	$ (32,682)	$ 213,011	$ 207
Increase (Decrease) in Stockholders' Equity
Net earnings	65,948			65,963		65,963	(15)
Other comprehensive loss	(4,636)				(4,636)	(4,636)
Shares issued for consideration:
Exercise of stock options	5,656	4	5,652			5,656
Income tax effect from the exercise of stock options and vesting of equity awards	826		826			826
Shares issued under stock incentive plan		1	(1)
Shares issued to Board of Directors in lieu of cash	100		100			100
Stock-based compensation	8,166		8,166			8,166
Cash dividend ($0.51, $0.60, and $0.60 per share in 2015, 2016, and 2017, respectively)	(25,079)			(25,079)		(25,079)
Purchase of common stock	(8,725)	(4)	(8,721)			(8,725)
Ending Balance at Dec. 31, 2015	255,474	488	47,165	244,947	(37,318)	255,282	192
Increase (Decrease) in Stockholders' Equity
Net earnings	82,114			82,084		82,084	30
Other comprehensive loss	(6,085)				(6,085)	(6,085)
Shares issued for consideration:
Exercise of stock options	2,772	2	2,770			2,772
Shares issued under stock incentive plan		3	(3)
Shares issued to Board of Directors in lieu of cash	75		75			75
Stock-based compensation	10,469		10,603	(134)		10,469
Cash dividend ($0.51, $0.60, and $0.60 per share in 2015, 2016, and 2017, respectively)	(29,886)			(29,886)		(29,886)
Purchase of common stock	(5,464)	(2)	(5,462)			(5,464)
Ending Balance at Dec. 31, 2016	309,469	491	55,148	297,011	(43,403)	309,247	222
Increase (Decrease) in Stockholders' Equity
Net earnings	80,192			80,163		80,163	29
Other comprehensive loss	(371)				(371)	(371)
Shares issued for consideration:
Exercise of stock options	472		472			472
Shares issued under stock incentive plan	4	7	(3)			4
Shares issued to Board of Directors in lieu of cash	125		125			125
Stock-based compensation	9,658	(1)	9,659			9,658
Cash dividend ($0.51, $0.60, and $0.60 per share in 2015, 2016, and 2017, respectively)	(29,870)			(29,870)		(29,870)
Purchase of common stock	(10,950)	(4)	(10,946)			(10,950)
Ending Balance at Dec. 31, 2017	$ 358,729	$ 493	$ 54,455	$ 347,304	$ (43,774)	$ 358,478	$ 251