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Stockholders' Equity - Additional Information (Detail) (USD $) | 3 Months Ended | 1 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Employees | Mar. 31, 2013 Stock Repurchase Plan | Jul. 25, 2012 Stock Repurchase Plan Maximum | Apr. 24, 2013 Dividend Declared Subsequent Event
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Dividend declaration date |  |  |  |  |  | Apr. 24, 2013
Dividend per share, declared |  |  |  |  |  | $ 0.05
Dividend payment date | Mar. 29, 2013 | Mar. 30, 2012 |  |  |  | Jun. 28, 2013
Dividend record date |  |  |  |  |  | Jun. 14, 2013
Amount approved for repurchases under stock buyback program |  |  |  | $ 51,100,000 | $ 150,000,000 |
Treasury stock shares acquired |  |  | 637,624 | 0 |  |
Purchase price for treasury stock acquired | $ 15,201,000 |  | $ 15,200,000 |  |  |

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