Restructuring, acquisition and integration-related costs (Restructuring Reserve) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2014	$ 4,878
Provision	13,818	$ 8,751
Cash payments	(8,844)
Non-cash items	(13,320)
Balance as of July 4, 2015	$ 4,103
Period in which lease impairments, severance and other restructuring costs are expected to be paid	4 years
Lease Impairments [Member]
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2014	$ 1,741
Cash payments	(2,437)
Non-cash items	0
Balance as of July 4, 2015	1,181
Asset Write-Down [Member]
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2014	0
Cash payments	0
Non-cash items	(14,144)
Balance as of July 4, 2015	0
Severance [Member]
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2014	3,037
Cash payments	(2,814)
Non-cash items	0
Balance as of July 4, 2015	2,858
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2014	100
Cash payments	(3,593)
Non-cash items	824
Balance as of July 4, 2015	64
Operating Segments [Member] | Global Ceramic Segment [Member]
Restructuring Reserve [Roll Forward]
Provision	317
Operating Segments [Member] | Global Ceramic Segment [Member] | Lease Impairments [Member]
Restructuring Reserve [Roll Forward]
Provision	0
Operating Segments [Member] | Global Ceramic Segment [Member] | Asset Write-Down [Member]
Restructuring Reserve [Roll Forward]
Provision	1,141
Operating Segments [Member] | Global Ceramic Segment [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Provision	0
Operating Segments [Member] | Global Ceramic Segment [Member] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Provision	(824)
Operating Segments [Member] | Flooring NA Segment [Member]
Restructuring Reserve [Roll Forward]
Provision	11,480
Operating Segments [Member] | Flooring NA Segment [Member] | Lease Impairments [Member]
Restructuring Reserve [Roll Forward]
Provision	1,877
Operating Segments [Member] | Flooring NA Segment [Member] | Asset Write-Down [Member]
Restructuring Reserve [Roll Forward]
Provision	5,416
Operating Segments [Member] | Flooring NA Segment [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Provision	1,700
Operating Segments [Member] | Flooring NA Segment [Member] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Provision	2,487
Operating Segments [Member] | Flooring ROW Segment [Member]
Restructuring Reserve [Roll Forward]
Provision	9,592
Operating Segments [Member] | Flooring ROW Segment [Member] | Lease Impairments [Member]
Restructuring Reserve [Roll Forward]
Provision	0
Operating Segments [Member] | Flooring ROW Segment [Member] | Asset Write-Down [Member]
Restructuring Reserve [Roll Forward]
Provision	7,587
Operating Segments [Member] | Flooring ROW Segment [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Provision	935
Operating Segments [Member] | Flooring ROW Segment [Member] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Provision	$ 1,070