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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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Summary of significant accounting policy.

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Amount of the effect of a change in accounting principle on operating profit or loss.

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