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New Financial Accounting Pronouncements - Additional Information (Detail) - ASU 2016-09 [Member] - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Jan. 01, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Discrete tax benefit	$ 0.4
Retained Earnings [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative effect adjustment to reduce retained earnings		$ 0.1

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- Definition

Discrete tax expense benefit.

+ References

No definition available.

+ Details

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- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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