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Percentage of Accounts Receivable by Significant Customers (Detail) - Customer Concentration Risk - Accounts Receivable | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Dec. 31, 2017
GE Healthcare |  |
Concentration Risk [Line Items] |  |
Accounts receivable, percentage by customer | 17.00% | 11.00%
MilliporeSigma |  |
Concentration Risk [Line Items] |  |
Accounts receivable, percentage by customer | 14.00% | 19.00%

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