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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	Mar. 31, 2017 USD ($)
ASU No. 2016-09 [Member]
Change In Accounting Estimate [Line Items]
Gross cumulative effect	$ 7.5

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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