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Stockholders' Equity - Additional Information (Detail) (USD $) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2013 Director | Feb. 15, 2013 | Dec. 31, 2012
Equity [Line Items] |  |  |
Percentage of directors elected by common stock holders | 25.00% |  |
Number of directors | 2 |  |
Conversion of Class B common stock | 1 |  |
Preferred stock, shares authorized | 100,000,000 |  | 100,000,000
Preferred stock, par value | $ 0.001 |  | $ 0.001
Preferred stock, shares issued | 0 |  | 0
Authorized the repurchase of shares of common stock |  | 250,000,000 |
Common stock outstanding shares repurchased | 675,000 |  |
Average price of shares repurchased, common stock | $ 42.4 |  |
Common stock shares remains payable | $ 8,292,000 |  |
Remaining authorized share repurchased amount | $ 207,600,000 |  |
Dividend declared on common stock | $ 0 |  |
Common Stock [Member] |  |  |
Equity [Line Items] |  |  |
Common stock, shares authorized | 1,600,000,000 |  | 1,600,000,000
Common stock, par value | $ 0.001 |  | $ 0.001
Vote per common stock share | One |  |
Common stock, shares issued | 131,127,919 |  | 130,060,138
Common stock, shares outstanding | 130,452,919 |  | 130,060,138
Class B Common Stock [Member] |  |  |
Equity [Line Items] |  |  |
Common stock, shares authorized | 400,000,000 |  | 400,000,000
Common stock, par value | $ 0.001 |  | $ 0.001
Vote per common Class B stock share | 10 |  |
Authorized Class B common stock shares | 400,000,000 |  |
Common Stock Class B par value per share | $ 0.001 |  |
Common stock, shares issued | 12,799,999 |  | 12,799,999
Common stock, shares outstanding | 12,799,999 |  | 12,799,999

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