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Fair Value Measurements - Additional Information (Detail) £ in Millions, $ in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2020 GBP (£) | Mar. 31, 2020 CAD ($) | Mar. 31, 2019 USD ($)
Derivative [Line Items] |  |  |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | $ 0.0 |  |  | $ 0.0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0.0 |  |  | $ 0.0
Foreign Exchange Forward [Member] | Canada, Dollars |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, notional amount |  |  | $ 24 |
Fair value unrealized gain | (0.5) |  |  |
Foreign Exchange Forward [Member] | United Kingdom, Pounds |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, notional amount | £ |  | £ 10 |  |
Fair value unrealized gain | $ 1.0 |  |  |

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