Restructuring, acquisition and integration-related costs - Restructuring Reserve (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2017	$ 1,095
Restructuring costs	42,791	$ 27,099
Cash payments	(37,215)
Non-cash items	(4,330)
Balance as of September 29, 2018	2,341
Lease impairments
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2017	359
Cash payments	(500)
Non-cash items	0
Balance as of September 29, 2018	95
Asset write-downs
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2017	0
Cash payments	0
Non-cash items	(730)
Balance as of September 29, 2018	0
Severance
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2017	584
Cash payments	(11,197)
Non-cash items	(155)
Balance as of September 29, 2018	2,182
Other restructuring costs
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2017	152
Cash payments	(25,518)
Non-cash items	(3,445)
Balance as of September 29, 2018	64
Provision - Corporate
Restructuring Reserve [Roll Forward]
Restructuring costs	476
Provision - Corporate | Lease impairments
Restructuring Reserve [Roll Forward]
Restructuring costs	0
Provision - Corporate | Asset write-downs
Restructuring Reserve [Roll Forward]
Restructuring costs	0
Provision - Corporate | Severance
Restructuring Reserve [Roll Forward]
Restructuring costs	476
Provision - Corporate | Other restructuring costs
Restructuring Reserve [Roll Forward]
Restructuring costs	0
Operating segments | Provision - Global Ceramic segment
Restructuring Reserve [Roll Forward]
Restructuring costs	6,674
Operating segments | Provision - Global Ceramic segment | Lease impairments
Restructuring Reserve [Roll Forward]
Restructuring costs	0
Operating segments | Provision - Global Ceramic segment | Asset write-downs
Restructuring Reserve [Roll Forward]
Restructuring costs	30
Operating segments | Provision - Global Ceramic segment | Severance
Restructuring Reserve [Roll Forward]
Restructuring costs	6,557
Operating segments | Provision - Global Ceramic segment | Other restructuring costs
Restructuring Reserve [Roll Forward]
Restructuring costs	87
Operating segments | Provision - Flooring NA segment
Restructuring Reserve [Roll Forward]
Restructuring costs	34,810
Operating segments | Provision - Flooring NA segment | Lease impairments
Restructuring Reserve [Roll Forward]
Restructuring costs	236
Operating segments | Provision - Flooring NA segment | Asset write-downs
Restructuring Reserve [Roll Forward]
Restructuring costs	700
Operating segments | Provision - Flooring NA segment | Severance
Restructuring Reserve [Roll Forward]
Restructuring costs	4,985
Operating segments | Provision - Flooring NA segment | Other restructuring costs
Restructuring Reserve [Roll Forward]
Restructuring costs	28,889
Operating segments | Provision - Flooring ROW segment
Restructuring Reserve [Roll Forward]
Restructuring costs	831
Operating segments | Provision - Flooring ROW segment | Lease impairments
Restructuring Reserve [Roll Forward]
Restructuring costs	0
Operating segments | Provision - Flooring ROW segment | Asset write-downs
Restructuring Reserve [Roll Forward]
Restructuring costs	0
Operating segments | Provision - Flooring ROW segment | Severance
Restructuring Reserve [Roll Forward]
Restructuring costs	932
Operating segments | Provision - Flooring ROW segment | Other restructuring costs
Restructuring Reserve [Roll Forward]
Restructuring costs	$ (101)