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Summary of Significant Accounting Policies and Recently Issued Accounting Standards - Schedule of Impact on Consolidated Statement of Cash Flows (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Impact on Net Cash provided by Operating Activities	$ 6.8	$ 13.1
Imapct on Net Cash used in Financing Activities	(6.8)	(13.1)
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Impact on Net Cash provided by Operating Activities	6.8	13.1
Imapct on Net Cash used in Financing Activities	$ (6.8)	$ (13.1)