Restructuring, acquisition and integration-related costs - Restructuring Reserve (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2015	$ 10,030
Provision	9,524	$ 13,818
Cash payments	(4,850)
Non-cash items	(2,942)
Balance as of July 2, 2016	11,762
Asset write-downs [Member]
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2015	0
Cash payments	0
Non-cash items	(2,179)
Balance as of July 2, 2016	0
Severance [Member]
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2015	8,965
Cash payments	(7,102)
Non-cash items	60
Balance as of July 2, 2016	3,107
Other restructuring costs [Member]
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2015	1,065
Cash payments	2,252
Non-cash items	(823)
Balance as of July 2, 2016	8,655
Operating Segments [Member] | Global Ceramic Segment [Member]
Restructuring Reserve [Roll Forward]
Provision	901
Operating Segments [Member] | Global Ceramic Segment [Member] | Asset write-downs [Member]
Restructuring Reserve [Roll Forward]
Provision	795
Operating Segments [Member] | Global Ceramic Segment [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Provision	0
Operating Segments [Member] | Global Ceramic Segment [Member] | Other restructuring costs [Member]
Restructuring Reserve [Roll Forward]
Provision	106
Operating Segments [Member] | Flooring NA Segment [Member]
Restructuring Reserve [Roll Forward]
Provision	9,395
Operating Segments [Member] | Flooring NA Segment [Member] | Asset write-downs [Member]
Restructuring Reserve [Roll Forward]
Provision	1,158
Operating Segments [Member] | Flooring NA Segment [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Provision	0
Operating Segments [Member] | Flooring NA Segment [Member] | Other restructuring costs [Member]
Restructuring Reserve [Roll Forward]
Provision	8,237
Operating Segments [Member] | Flooring ROW Segment [Member]
Restructuring Reserve [Roll Forward]
Provision	(772)
Operating Segments [Member] | Flooring ROW Segment [Member] | Asset write-downs [Member]
Restructuring Reserve [Roll Forward]
Provision	226
Operating Segments [Member] | Flooring ROW Segment [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Provision	1,184
Operating Segments [Member] | Flooring ROW Segment [Member] | Other restructuring costs [Member]
Restructuring Reserve [Roll Forward]
Provision	$ (2,182)