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Additional Information on Non-vested Restricted Stock (Detail) - Restricted Stock Awards $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate intrinsic value	$ 34.0
Weighted-average remaining vesting period	1 year 3 months 18 days
Unrecognized compensation cost	$ 19.6

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options nonvested weighted average remaining vesting term

+ References

No definition available.

+ Details

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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

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- Definition

Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

+ References

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