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Financial Instruments - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items] |  |  |
Expense related to increase in fair value of future expected contingent consideration | $ 0 | $ 200,000 |
Senior Notes | 6.0% senior notes due 2022 |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |
Interest rate (as a percent) |  |  | 6.00%
Debt maturity period |  |  | 2022

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