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Fair Value Measurements - Additional Information (Detail) - Foreign Exchange Forward $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($)
Derivative [Line Items] |  |  |  |
Derivative, notional amount |  |  | $ 14,000,000.0 | $ 30,000,000.0
Fair value unrealized gain | $ 0.1 | $ 1.0 |  |

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