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Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
ASU 2015-17
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Reclassification of net current deferred tax assets to net non-current deferred tax liability	$ 2.4	$ 2.4
ASU 2015-03
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Unamortized debt issuance costs previously recorded as other assets		$ 15.0

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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