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Goodwill and intangible assets - Schedule of goodwill (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 29, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning balance | $ 3,798,884 |
Accumulated impairment losses | (1,327,425) | $ (1,327,425)
Goodwill, net, beginning balance | 2,471,459 |
Goodwill recognized during the period | 101,184 |
Currency translation during the period | (50,504) |
Goodwill, gross, ending balance | 3,849,564 |
Accumulated impairment losses | (1,327,425) | (1,327,425)
Goodwill, net, ending balance | 2,522,139 |
Global Ceramic segment |  |
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning balance | 1,567,872 |
Accumulated impairment losses | (531,930) | (531,930)
Goodwill, net, beginning balance | 1,035,942 |
Goodwill recognized during the period | 0 |
Currency translation during the period | (15,842) |
Goodwill, gross, ending balance | 1,552,030 |
Accumulated impairment losses | (531,930) | (531,930)
Goodwill, net, ending balance | 1,020,100 |
Flooring NA segment |  |
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning balance | 869,764 |
Accumulated impairment losses | (343,054) | (343,054)
Goodwill, net, beginning balance | 526,710 |
Goodwill recognized during the period | 5,184 |
Currency translation during the period | 0 |
Goodwill, gross, ending balance | 874,948 |
Accumulated impairment losses | (343,054) | (343,054)
Goodwill, net, ending balance | 531,894 |
Flooring ROW segment |  |
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning balance | 1,361,248 |
Accumulated impairment losses | (452,441) | (452,441)
Goodwill, net, beginning balance | 908,807 |
Goodwill recognized during the period | 96,000 |
Currency translation during the period | (34,662) |
Goodwill, gross, ending balance | 1,422,586 |
Accumulated impairment losses | (452,441) | $ (452,441)
Goodwill, net, ending balance | $ 970,145 |

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