Goodwill and intangible assets (Narrative)(Details) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 28, 2013	Dec. 31, 2012	May 03, 2013 Spano Invest NV [Member]	Jan. 10, 2013 Pergo [Member]	Apr. 03, 2013 Marrazzi Group [Member]
Goodwill [Line Items]
Goodwill	$ 1,713,883	$ 1,385,771	$ 35,857	$ 24,501	$ 261,124
Goodwill acquired during the period	$ 321,482

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant