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Recent Accounting Pronouncements - Additional Information (Detail) - ASU 2016-09 [Member] $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Recognition of an excess tax benefit and deficiency	$ 1.1
Increase in annual effective tax rate due to recognition of an excess tax benefit and deficiency	3.20%

X

- Definition

Percentage of increase in effective income tax rate impact due to adoption of new accounting standard update.

+ References

No definition available.

+ Details

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X

- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- 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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