ACQUISITIONS - Net Sales and Earnings of Acquiree Included in Consolidated Results (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Feb. 03, 2014
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest		$ 95,000
Net Sales and Earnings of Acquiree Included in Consolidated Results [Abstract]
Business Combination, Contingent Consideration, Liability		(16,000)
Holly Hunt Enterprises, Inc [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest		95,000
Net Sales and Earnings of Acquiree Included in Consolidated Results [Abstract]
Net sales	17,360
Net earnings attributable to Knoll, Inc. stockholders	1,106
Business Combination, Contingent Consideration, Liability		$ 16,000