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Stock-Based Awards - Additional Information (Detail) | 3 Months Ended
--- | ---
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock option issuance period | 10 years
Option issued period | Options are issued generally for terms of ten years
Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Option vested period | 3 years
Minimum [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Option vested period | 2 years
Maximum [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Option vested period | 4 years

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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=6415400&loc=d3e5070-113901 + Details
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- Definition Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Stock option issuance period. + References No definition available. + Details
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