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Restructuring and other impairment charges - Restructuring program (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | $ 17,103 | $ 15,239 | $ 60,120
Asset impairment charges | 21,388 | 6,966 | 19,110
Total restructuring and impairment charges | 38,491 | 22,205 | 79,230
2020 Workforce reduction plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | 8,847 |  |
2019 Footprint realignment plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | 1,542 | 13,753 |
2018 Footprint realignment plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | 5,948 | (939) | 54,993
Other restructuring programs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | 766 | 2,425 | 5,127
Termination benefits |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | 14,634 | 12,683 | 57,812
Asset impairment charges | 0 | 0 | 0
Total restructuring and impairment charges | 14,634 | 12,683 | 57,812
Termination benefits | 2020 Workforce reduction plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | 8,494 |  |
Termination benefits | 2019 Footprint realignment plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | 647 | 13,683 |
Termination benefits | 2018 Footprint realignment plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | 5,565 | (1,787) | 53,992
Termination benefits | Other restructuring programs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | (72) | 787 | 3,820
Other costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | 2,469 | 2,556 | 2,308
Asset impairment charges | 21,388 | 6,966 | 19,110
Total restructuring and impairment charges | 23,857 | 9,522 | 21,418
Other costs | 2020 Workforce reduction plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | 353 |  |
Other costs | 2019 Footprint realignment plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | 895 | 70 |
Other costs | 2018 Footprint realignment plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | 383 | 848 | 1,001
Other costs | Other restructuring programs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | $ 838 | $ 1,638 | $ 1,307

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