CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Net sales	$ 229,331	$ 200,586
Cost of sales	152,856	136,959
Gross profit	76,475	63,627
Selling, general, and administrative expenses	64,650	53,333
Operating profit	11,825	10,294	[1]
Interest expense	1,671	1,495
Other (income) expense, net	(2,504)	(1,291)
Income before income tax expense	12,658	10,090
Income tax expense	4,466	4,016
Net earnings	8,192	6,074
Net earnings attributable to noncontrolling interests	6	0
Net earnings attributable to Knoll, Inc. stockholders	8,186	6,074
Net earnings per common share attributable to Knoll, Inc. stockholders:
Basic (in dollars per share)	$ 0.17	$ 0.13
Diluted (in dollars per share)	$ 0.17	$ 0.13
Dividends per share (in dollars per share)	$ 0.12	$ 0.12
Weighted-average number of common shares outstanding:
Basic	47,200,099	46,833,216
Diluted	48,048,994	47,572,486
Net earnings	8,192	6,074
Other comprehensive income (loss):
Foreign currency translation adjustment	(3,819)	(2,525)
Pension and other post-retirement liability adjustment, net of tax	64	956
Total other comprehensive income (loss), net of tax	(3,755)	(1,569)
Total comprehensive income	4,437	4,505
Comprehensive income attributable to noncontrolling interests	6	0
Comprehensive income attributable to Knoll, Inc. stockholders	$ 4,431	$ 4,505

[1] The Company does not allocate interest expense or other (income) expense, net to the reportable segments.