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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Jan. 01, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Antidilutive options	648,900	2,878,700
Stock options
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Antidilutive options		548,800
Accounting Standards Update 2016-16
Organization, Consolidation and Presentation of Financial Statements [Abstract]
New accounting pronouncement, cumulative effect of change on prepaid income taxes and retained earnings			$ (19.9)

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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