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Stockholders' Equity - Additional Information (Detail) (USD $)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Preferred Stock, shares authorized | 10,000,000 | 10,000,000 | |
| Preferred Stock, par value | $ 0.001 | $ 0.001 | |
| Certain Class B stockholders converted into Class A | 22,880 | 13,640 | 1,049,005 |
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CLASS A COMMON STOCK [Member]
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| Common Stock, shares authorized | 100,000,000 | 100,000,000 | |
| Common Stock, par value | $ 0.001 | $ 0.001 | |
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CLASS B COMMON STOCK [Member]
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| Common Stock, shares authorized | 60,000,000 | 60,000,000 | |
| Common Stock, par value | $ 0.001 | $ 0.001 | |
| X | ||||||||||
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- Definition
Stock converted from one class to other class, shares. No definition available.
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| X | ||||||||||
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- Definition
Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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