Segment Reporting - Percentage of Revenue from Significant Customers (Detail) - Customer Concentration Risk - Sales Revenue	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
MilliporeSigma
Revenue, Major Customer [Line Items]
Revenue from significant customers as a percentage of total revenue	16.00%	17.00%
GE Healthcare
Revenue, Major Customer [Line Items]
Revenue from significant customers as a percentage of total revenue	13.00%	14.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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