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Additional Information on Non-vested Restricted Stock (Detail) - Restricted Stock Awards $ in Millions | 12 Months Ended
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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 + Details
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