v2.4.1.9

Stockholders' Equity - Additional Information (Detail) | 0 Months Ended | 12 Months Ended
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May 14, 2012 | Dec. 31, 2014 | Dec. 31, 2013
Equity [Abstract] |  |  |
Repurchase of common stock authorized remaining (shares) |  |  | 1,225,750 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Repurchase of common stock (shares) | 2,774,250 us-gaap_TreasuryStockSharesAcquired | 0 us-gaap_TreasuryStockSharesAcquired | 0 us-gaap_TreasuryStockSharesAcquired

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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