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Goodwill and intangible assets (Tables) | 6 Months Ended
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Jul. 04, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of goodwill | Goodwill:
| Global Ceramic segment |  | Flooring NA segment |  | Flooring ROW segment |  | Total
Balance as of December 31, 2014 |  |  |  |  |  |  |
Goodwill | $ | 1,395,132 |  |  | 538,515 |  |  | 998,130 |  |  | 2,931,777 |
Accumulated impairment losses | (531,930 | ) |  | (343,054 | ) |  | (452,441 | ) |  | (1,327,425 | )
| $ | 863,202 |  |  | 195,461 |  |  | 545,689 |  |  | 1,604,352 |
Goodwill recognized or adjusted during the period | $ | 100,048 |  |  | 329,401 |  |  | 311,317 |  |  | 740,766 |
Currency translation during the period | (106 | ) |  | — |  |  | (50,798 | ) |  | (50,904 | )
Balance as of July 4, 2015 |  |  |  |  |  |  |
Goodwill | 1,495,074 |  |  | 867,916 |  |  | 1,258,649 |  |  | 3,621,639 |
Accumulated impairment losses | (531,930 | ) |  | (343,054 | ) |  | (452,441 | ) |  | (1,327,425 | )
| $ | 963,144 |  |  | 524,862 |  |  | 806,208 |  |  | 2,294,214 |
Schedule of indefinite life assets not subject to amortization | Intangible assets not subject to amortization:
| Tradenames
Balance as of December 31, 2014 | $ | 622,691 |
Intangible assets acquired during the period | 48,563 |
Currency translation during the period | (26,358 | )
Balance as of July 4, 2015 | $ | 644,896 |
Schedule of intangible assets subject to amortization | Intangible assets subject to amortization:
Gross carrying amounts: | Customer relationships |  | Patents |  | Other |  | Total
Balance as of December 31, 2014 | $ | 354,768 |  |  | 270,466 |  |  | 1,479 |  |  | 626,713 |
Intangible assets acquired during the period | 223,825 |  |  | — |  |  | 501 |  |  | 224,326 |
Currency translation during the period | (19,364 | ) |  | (23,179 | ) |  | — |  |  | (42,543 | )
Balance as of July 4, 2015 | $ | 559,229 |  |  | 247,287 |  |  | 1,980 |  |  | 808,496 |
Accumulated amortization: | Customer relationships |  | Patents |  | Other |  | Total
Balance as of December 31, 2014 | $ | 320,851 |  |  | 225,875 |  |  | 669 |  |  | 547,395 |
Amortization during the period | 4,473 |  |  | 6,892 |  |  | 5 |  |  | 11,370 |
Currency translation during the period | (17,301 | ) |  | (19,383 | ) |  | 15 |  |  | (36,669 | )
Balance as of July 4, 2015 | $ | 308,023 |  |  | 213,384 |  |  | 689 |  |  | 522,096 |
Intangible assets subject to amortization, net | $ | 251,206 |  |  | 33,903 |  |  | 1,291 |  |  | 286,400 |
Schedule of intangible assets amortization expense |
| Three Months Ended |  | Six Months Ended
| July 4, 2015 |  | June 28, 2014 |  | July 4, 2015 |  | June 28, 2014
Amortization expense | $ | 6,264 |  |  | 6,509 |  |  | 11,370 |  |  | 12,547 |
Estimated amortization expense for the years ending December 31 are as follows:
2015 | $ | 28,321 |
2016 | 34,864 |
2017 | 33,449 |
2018 | 24,757 |
2019 | 21,711 |

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