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Share-based Compensation - Additional Information (Detail) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Shares issued under stock purchase plan | 69,572 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 56,281 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 501,862 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 199,725 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans

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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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