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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017 | Jan. 01, 2018
ASU 2016-01 [Member] |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Reclassification of net unrealized gains from accumulated other comprehensive income to opening retained earnings |  |  | $ 3.2
ASU 2017-07 [Member] |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Reclassified from cost of sales, selling, general and administrative expenses, and research and development expense to other expense, net | $ 0.1 | $ 0.2 |

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