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Unaudited Quarterly Results - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Incremental stock-based compensation cost due to acceleration of awards |  |  | $ 1,000 |  | $ 4,000 |  |  | $ 1,000 | $ 4,000 | $ 7,000
Litigation (settlement) provisions | $ 322 | $ 924 | $ (1,672) | $ 1,096 |  | $ 10,018 |  | (426) | 11,114 | $ 3,524
Acquired in-process research and development |  |  |  |  |  |  | $ 5,000 |  | 5,000 |
Income tax provision related to 2017 Tax Act |  |  |  | $ 550,000 |  |  |  | (6,059) | $ 550,000 |
Waters Retirement Plan [Member] |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Defined benefit plan, settlement charge | 46,000 |  |  |  |  |  |  | 46,000 |  |
Defined benefit plan, settlement charge, cash contribution | 6,000 |  |  |  |  |  |  | 6,000 |  |
Defined benefit plan, settlement charge, non-cash | $ 40,000 |  |  |  |  |  |  | $ 40,000 |  |

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