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Goodwill and other intangible assets - changes in carrying amount by reporting segment (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |  |
Goodwill |  |  | $ 1,627,980
Accumulated impairment losses |  |  | (332,128)
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | $ 1,276,720 | $ 1,295,852 |
Goodwill related to acquisitions | 893,711 | 3,689 |
Translation adjustment | 65,161 | (22,821) |
Goodwill, ending balance | 2,235,592 | 1,276,720 |
Vascular North America |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  |  | 485,986
Accumulated impairment losses |  |  | (219,527)
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 266,459 | 266,459 |
Goodwill related to acquisitions | 0 | 0 |
Translation adjustment | (1,590) | 0 |
Goodwill, ending balance | 264,869 | 266,459 |
Interventional North America |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  |  | 84,615
Accumulated impairment losses |  |  | (5,528)
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 79,087 | 79,087 |
Goodwill related to acquisitions | 342,901 | 0 |
Translation adjustment | 11,061 | 0 |
Goodwill, ending balance | 433,049 | 79,087 |
Anesthesia North America |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  |  | 225,653
Accumulated impairment losses |  |  | (84,531)
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 141,253 | 141,122 |
Goodwill related to acquisitions | 15,599 | 0 |
Translation adjustment | 437 | 131 |
Goodwill, ending balance | 157,289 | 141,253 |
Surgical North America |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  |  | 250,912
Accumulated impairment losses |  |  | 0
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 250,912 | 250,912 |
Goodwill related to acquisitions | 0 | 0 |
Translation adjustment | 0 | 0 |
Goodwill, ending balance | 250,912 | 250,912 |
EMEA |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  |  | 306,009
Accumulated impairment losses |  |  | 0
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 290,041 | 306,009 |
Goodwill related to acquisitions | 161,543 | 0 |
Translation adjustment | 42,964 | (15,968) |
Goodwill, ending balance | 494,548 | 290,041 |
Asia |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  |  | 141,067
Accumulated impairment losses |  |  | 0
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 138,185 | 141,067 |
Goodwill related to acquisitions | 59,954 | 0 |
Translation adjustment | 11,061 | (2,882) |
Goodwill, ending balance | 209,200 | 138,185 |
OEM |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  |  | 1,194
Accumulated impairment losses |  |  | 0
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 4,883 | 1,194 |
Goodwill related to acquisitions | 0 | 3,689 |
Translation adjustment | 0 | 0 |
Goodwill, ending balance | 4,883 | 4,883 |
All other |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  |  | 132,544
Accumulated impairment losses |  |  | $ (22,542)
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 105,900 | 110,002 |
Goodwill related to acquisitions | 313,714 | 0 |
Translation adjustment | 1,228 | (4,102) |
Goodwill, ending balance | $ 420,842 | $ 105,900 |

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