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Earnings Per Share - Additional Information (Detail) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Equity [Abstract] |  |  |  |
Basic and diluted weighted-average common and common shares outstanding | 38,167,000 | 34,070,000 | 35,568,000 | 33,902,000
Acquisition of common stock from anti-dilutive securities | 4,761,066 | 5,668,752 | 5,313,009 | 5,885,100

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- Definition Acquisition of Common Stock from Anti Dilutive Securities + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
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