RECONCILIATION OF PREVIOUSLY REPORTED AMOUNTS TO AMOUNTS AS RESTATED Restated Consolidated Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 19,021	$ 12,026	$ 29,956	$ 28,263
Customer receivables, net	114,551	103,755
Inventories	140,835	96,671
Deferred income taxes	15,868	10,030
Prepaid and other current assets	21,544	12,145
Total current assets	311,819	234,627
Property, plant, and equipment, net	165,019	137,893	124,838
Goodwill	128,918	79,951
Intangible assets, net	253,739	214,695
Other non-trade receivables	3,278	4,250
Other noncurrent assets	6,170	4,346
Total Assets	868,943	675,762
Current liabilities:
Accounts payable	114,914	91,378
Income taxes payable	12,895	438
Other current liabilities	93,965	75,984
Total current liabilities	231,774	167,800
Equity:
Long-term debt	248,000	173,000
Deferred income taxes	64,203	75,057
Postretirement benefits other than pensions	8,765	8,908
Pension liability	70,770	5,615
Other current liabilities	32,213	21,555
Total liabilities	655,725	451,935
Common stock	487	483
Additional paid-in capital	41,143	37,258
Retained earnings	204,063	180,949
Accumulated other comprehensive income (loss)	(32,682)	5,137	(26,778)	(15,886)
Total Knoll, Inc. stockholders' equity	213,011	223,827
Total Liabilities and Equity	868,943	675,762
As previously reported
Current assets:
Cash and cash equivalents		12,026	29,956	28,263
Customer receivables, net		104,171
Inventories		96,449
Deferred income taxes		11,408
Prepaid and other current assets		12,145
Total current assets		236,199
Property, plant, and equipment, net		137,893
Goodwill		79,951
Intangible assets, net		214,695
Other non-trade receivables		4,250
Other noncurrent assets		4,346
Total Assets		677,334
Current liabilities:
Accounts payable		91,378
Income taxes payable		249
Other current liabilities		76,676
Total current liabilities		168,303
Equity:
Long-term debt		173,000
Deferred income taxes		75,670
Postretirement benefits other than pensions		8,908
Pension liability		5,615
Other current liabilities		17,396
Total liabilities		448,892
Common stock		483
Additional paid-in capital		37,258
Retained earnings		184,799
Accumulated other comprehensive income (loss)		5,902
Total Knoll, Inc. stockholders' equity		228,442
Total Liabilities and Equity		677,334
Correction of prior period misstatements
Current assets:
Cash and cash equivalents		0	0	0
Customer receivables, net		(416)
Inventories		222
Deferred income taxes		(1,378)
Prepaid and other current assets		0
Total current assets		(1,572)
Property, plant, and equipment, net		0
Goodwill		0
Intangible assets, net		0
Other non-trade receivables		0
Other noncurrent assets		0
Total Assets		(1,572)
Current liabilities:
Accounts payable		0
Income taxes payable		189
Other current liabilities		(692)
Total current liabilities		(503)
Equity:
Long-term debt		0
Deferred income taxes		(613)
Postretirement benefits other than pensions		0
Pension liability		0
Other current liabilities		4,159
Total liabilities		3,043
Common stock		0
Additional paid-in capital		0
Retained earnings		(3,850)
Accumulated other comprehensive income (loss)		(765)
Total Knoll, Inc. stockholders' equity		(4,615)
Total Liabilities and Equity		$ (1,572)