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Stock-Based Compensation and Employee Benefit Plans - Additional Information (Detail) (USD $)
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3 Months Ended | 3 Months Ended | 3 Months Ended | ||||||||
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Mar. 31, 2014
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Dec. 31, 2013
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Mar. 31, 2014
Class A Common Stock [Member]
vote
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Dec. 31, 2013
Class A Common Stock [Member]
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Mar. 31, 2014
Class B Common Stock [Member]
vote
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Dec. 31, 2013
Class B Common Stock [Member]
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Jan. 02, 2014
Equity Incentive Plan [Member]
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Mar. 31, 2014
Employee Stock Purchase Plan [Member]
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Jan. 02, 2014
Employee Stock Purchase Plan [Member]
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Mar. 31, 2014
RSU and RSA
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Mar. 31, 2013
RSU and RSA
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 9.93 | $ 5.46 | |||||||||
| Percentage of fair value market of common stock | 100.00% | ||||||||||
| Vesting period for new restricted stock units | 4 years | ||||||||||
| Term of option granted, minimum | 7 years | ||||||||||
| Term of option granted, maximum | 10 years | ||||||||||
| Shares authorized for issuance | 1,400,000 | 400,000 | |||||||||
| Contribution of earnings by employees | 15.00% | ||||||||||
| Percentage of purchase of common stock | 85.00% | ||||||||||
| Percentage of common stock on the date of purchase | 85.00% | ||||||||||
| Common stock, shares authorized (shares) | 550,000,000 | 550,000,000 | 500,000,000 | 500,000,000 | 500,000,000 | 500,000,000 | |||||
| Voting rights per share | 1 | 10 | |||||||||
| Number of convertible common stock | 1 | ||||||||||