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Stockholders' Equity - Additional Information (Detail)
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6 Months Ended | 6 Months Ended | 1 Months Ended | |||
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Jun. 30, 2012
2012 Plan
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Jun. 30, 2012
2012 Plan
Minimum
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Jun. 30, 2012
2012 Plan
Maximum
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Jun. 30, 2012
Common Class A
2012 Plan
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Jun. 30, 2012
2005 Officer's Stock Plan
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Nov. 30, 2005
2005 Officer's Stock Plan
Common Class B
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| Stockholders Equity Note [Line Items] | ||||||
| Shares reserved for issuance under 2012 plan | 25,000,000 | |||||
| Shares reserved for issuance increase date | Jan. 01, 2013 | Jan. 01, 2022 | ||||
| Maximum term for stock options granted | 10 years | 10 years | ||||
| Shares of incentive and nonstatutory stock options provided for issuance | 120,000,000 | |||||
| Non statutory stock option issued to CEO to purchase shares of Class B common stock | 120,000,000 | |||||
| Options partially exercised and fully vested | 60,000,000 | |||||