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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 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 income (expense), net | $ 0.1 |

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- Definition Amount of the effect of a change in accounting principle on operating profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794 + Details
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