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Goodwill - Key assumptions (Detail)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Image-Guided Therapy [Member]    
Goodwill - Text Details (Detail) [Line Items]    
Initial forecast period 8.10% [1] 5.30% [2]
Growth rate used to extrapolate cash flow projections 5.20% [1],[3] 4.00% [2],[4]
Used to calculate terminal value 2.30% [1],[5] 2.30% [2],[6]
Discount rate applied to cash flow projections 9.30% 10.90%
Monitoring and Analytics [member]    
Goodwill - Text Details (Detail) [Line Items]    
Initial forecast period [1] 6.50%  
Growth rate used to extrapolate cash flow projections [1],[3] 4.00%  
Used to calculate terminal value [1],[5] 2.30%  
Discount rate applied to cash flow projections 9.90%  
Patient Care & Monitoring Solutions [Member]    
Goodwill - Text Details (Detail) [Line Items]    
Initial forecast period [2]   3.80%
Growth rate used to extrapolate cash flow projections [2],[4]   4.80%
Used to calculate terminal value [2],[6]   2.30%
Discount rate applied to cash flow projections   12.30%
Sleep & Respiratory Care [Member]    
Goodwill - Text Details (Detail) [Line Items]    
Initial forecast period 8.40% [1] 7.20% [2]
Growth rate used to extrapolate cash flow projections 4.80% [1],[3] 5.60% [2],[4]
Used to calculate terminal value 2.30% [1],[5] 2.30% [2],[6]
Discount rate applied to cash flow projections 10.60% 12.10%
[1] Compound sales growth rate is the annualized steady nominal growth rate over the forecast period
[2] Compound sales growth rate is the annualized steady nominal growth rate over the forecast period
[3] Also referred to later in the text as compound long-term sales growth rate
[4] Also referred to later in the text as compound long-term sales growth rate
[5] The historical long-term growth rate is only applied to the first year after the 4 year extrapolation period, after which no further growth is assumed for the terminal value calculation
[6] The historical long-term growth rate is only applied to the first year after the 5 year extrapolation period, after which no further growth is assumed for the terminal value calculation