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Recently Issued Accounting Pronouncements - Additional Information (Detail) - Accounting Standards Update 2017-07 [Member] - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Operating Income (Loss) [Member]
Change in Accounting Estimate [Line Items]
Impact on operating results	$ (1.2)	$ (2.3)
Other Nonoperating Income (Expense) [Member]
Change in Accounting Estimate [Line Items]
Impact on operating results	$ 1.2	$ 2.3

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
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