Restructuring, acquisition and integration-related costs - Restructuring Reserve (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2016	$ 11,426
Provision	16,353	$ 9,524
Cash payments	(17,441)
Non-cash items	(7,352)
Balance as of July 1, 2017	2,986
Lease impairments
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2016	0
Cash payments	(213)
Non-cash items	0
Balance as of July 1, 2017	595
Asset write-downs
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2016	0
Cash payments	(124)
Non-cash items	(7,309)
Balance as of July 1, 2017	0
Severance
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2016	5,183
Cash payments	(4,873)
Non-cash items	45
Balance as of July 1, 2017	1,260
Other restructuring costs
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2016	6,243
Cash payments	(12,231)
Non-cash items	(88)
Balance as of July 1, 2017	1,131
Operating segments | Provision - Global Ceramic segment
Restructuring Reserve [Roll Forward]
Provision	764
Operating segments | Provision - Global Ceramic segment | Lease impairments
Restructuring Reserve [Roll Forward]
Provision	492
Operating segments | Provision - Global Ceramic segment | Asset write-downs
Restructuring Reserve [Roll Forward]
Provision	0
Operating segments | Provision - Global Ceramic segment | Severance
Restructuring Reserve [Roll Forward]
Provision	261
Operating segments | Provision - Global Ceramic segment | Other restructuring costs
Restructuring Reserve [Roll Forward]
Provision	11
Operating segments | Provision - Flooring NA segment
Restructuring Reserve [Roll Forward]
Provision	13,356
Operating segments | Provision - Flooring NA segment | Lease impairments
Restructuring Reserve [Roll Forward]
Provision	316
Operating segments | Provision - Flooring NA segment | Asset write-downs
Restructuring Reserve [Roll Forward]
Provision	6,849
Operating segments | Provision - Flooring NA segment | Severance
Restructuring Reserve [Roll Forward]
Provision	0
Operating segments | Provision - Flooring NA segment | Other restructuring costs
Restructuring Reserve [Roll Forward]
Provision	6,191
Operating segments | Provision - Flooring ROW segment
Restructuring Reserve [Roll Forward]
Provision	2,233
Operating segments | Provision - Flooring ROW segment | Lease impairments
Restructuring Reserve [Roll Forward]
Provision	0
Operating segments | Provision - Flooring ROW segment | Asset write-downs
Restructuring Reserve [Roll Forward]
Provision	584
Operating segments | Provision - Flooring ROW segment | Severance
Restructuring Reserve [Roll Forward]
Provision	644
Operating segments | Provision - Flooring ROW segment | Other restructuring costs
Restructuring Reserve [Roll Forward]
Provision	$ 1,005