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Share-Based Compensation - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 shares
Outstanding Shares [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Remaining shares reserved for issuance | 2,064,493
Stock Option [Member] | Minimum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Stock option awards, expiration period | 5 years
Vested and non-vested stock awards, vesting service period | 1 year
Stock Option [Member] | Maximum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Stock option awards, expiration period | 10 years
Vested and non-vested stock awards, vesting service period | 3 years
Restricted Stock [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Vested and non-vested stock awards, vesting service period | 3 years
Performance Share Units [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Vested and non-vested stock awards, vesting service period | 3 years
Conversion ratio of awards vesting | 100.00%

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Share-based compensation arrangement by share based payment award conversion ratio. + References No definition available. + Details
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