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Stock-Based Compensation - Schedule of Information Regarding Restricted Stock Units Outstanding (Detail) - RSUs outstanding - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
RSUs outstanding, number of Shares | 508,880 | 427,192 | 487,423 | 564,891
RSUs vested and expected to vest using estimated forfeiture rates, number of shares | 414,847 | 349,759 | 414,934 |
RSUs outstanding, weighted average remaining contractual life (years) | 1 year 3 months 18 days | 11 months 4 days | 10 months 24 days |
RSUs vested and expected to vest using estimated forfeiture rates, weighted average remaining contractual life (years) | 1 year 1 month 27 days | 9 months 18 days | 10 months 13 days |
RSUs outstanding, aggregate intrinsic value | $ 3.6 | $ 4.5 | $ 5.7 |
RSUs vested and expected to vest using estimated forfeiture rates, aggregate intrinsic value | 2.9 | 3.7 | 4.8 |
RSUs outstanding, fair value | $ 3.6 | $ 4.5 | $ 5.7 |

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- Definition The current fair value of RSUs outstanding. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for RSUs outstanding, in 'PnYnMnDTnHnMnS' format. + References No definition available. + Details
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- Definition Amount of the current fair value of fully vested and expected to vest RSUs outstanding. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest RSUs outstanding, in 'PnYnMnDTnHnMnS' format. + References No definition available. + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options. + References No definition available. + Details
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