Restructuring, acquisition and integration-related costs - Restructuring Reserve (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2017	$ 1,095
Restructuring costs	31,311	$ 16,353
Cash payments	(25,718)
Non-cash items	(1,266)
Balance as of June 30, 2018	5,422
Lease impairments
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2017	359
Cash payments	(335)
Non-cash items	0
Balance as of June 30, 2018	260
Asset write-downs
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2017	0
Cash payments	0
Non-cash items	(714)
Balance as of June 30, 2018	0
Severance
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2017	584
Cash payments	(7,271)
Non-cash items	(143)
Balance as of June 30, 2018	5,046
Other restructuring costs and currency translation
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2017	152
Cash payments	(18,112)
Non-cash items	(409)
Balance as of June 30, 2018	116
Provision - Corporate
Restructuring Reserve [Roll Forward]
Restructuring costs	353
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	353
Provision - Corporate | Other restructuring costs and currency translation
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 and currency translation
Restructuring Reserve [Roll Forward]
Restructuring costs	87
Operating segments | Provision - Flooring NA segment
Restructuring Reserve [Roll Forward]
Restructuring costs	24,206
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	684
Operating segments | Provision - Flooring NA segment | Severance
Restructuring Reserve [Roll Forward]
Restructuring costs	4,814
Operating segments | Provision - Flooring NA segment | Other restructuring costs and currency translation
Restructuring Reserve [Roll Forward]
Restructuring costs	18,472
Operating segments | Provision - Flooring ROW segment
Restructuring Reserve [Roll Forward]
Restructuring costs	78
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	152
Operating segments | Provision - Flooring ROW segment | Other restructuring costs and currency translation
Restructuring Reserve [Roll Forward]
Restructuring costs	$ (74)