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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Jun. 30, 2019
Income Tax [Line Items] |  |
U.S. Federal statutory income tax rate |  | 21.00%
Canada - Germany APA |  |
Income Tax [Line Items] |  |
Advance Pricing Agreement, description |  | None of our U.S. and non-U.S. tax returns are currently under examination. As a result of prior audits in certain jurisdictions, which are now settled, in 2008 we filed Advance Pricing Agreement Requests with the tax authorities in the U.S., Canada and Germany.
German Subsidiary | Canada - Germany APA |  |
Income Tax [Line Items] |  |
Noncash income tax benefit related to APA tax settlement payment | $ 1.4 |

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