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Stockholders' Equity - Additional Information (Detail) - USD ($) | Feb. 03, 2021 | Jul. 22, 2020 | Apr. 22, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Jul. 24, 2019 | Feb. 06, 2019 | Jul. 25, 2018 | Sep. 06, 2013
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Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, par value |  |  |  | $ 0.01 | $ 0.01 |  |  |  |
Percentage of beneficial ownership required to exercise the right under Rights agreement, Description |  |  | 10% (12% for passive investors, subject to the Excluded Persons exception below) or more |  |  |  |  |  |
Percentage of discount on purchase of additional share in Right agreement |  |  | 50.00% |  |  |  |  |  |
Percentage of acquisition in merger or other unapproved party description |  |  | more than 10% (12% for passive investors, subject to the Excluded Persons exception below) |  |  |  |  |  |
Percentage of discount on share acquisition in merger or other unapproved party |  |  | 50.00% |  |  |  |  |  |
Percentage of beneficial ownership not exercisable prior to adoption of Right agreement, Description |  |  | 10% (12% for passive investors, subject to the Excluded Persons exception below) or more |  |  |  |  |  |
Redemption price of rights |  |  | $ 0.001 |  |  |  |  |  |
Rights agreement outstanding common stock acquisition percentage description |  | 20% or more |  |  |  |  |  |  |
Rights agreement common stock holding percentage description |  | 4.9% or more |  |  |  |  |  |  |
Expire period of Right agreement |  |  | Apr. 21, 2021 |  |  |  |  |  |
2013 program |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Increase of the authorization under the stock buyback program |  |  |  |  |  | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 |
Remaining amount approved for repurchases under stock buyback program |  |  |  | $ 130,000,000 |  |  |  |  |
2013 program | Maximum |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Amount approved for repurchases under stock buyback program |  |  |  |  |  |  |  |  | $ 200,000,000
Subsequent Event | Dividend Declared |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividend declaration date | Feb. 03, 2021 |  |  |  |  |  |  |  |
Dividend per share, declared | $ 0.02 |  |  |  |  |  |  |  |
Dividend payment date | Mar. 18, 2021 |  |  |  |  |  |  |  |
Dividend record date | Mar. 04, 2021 |  |  |  |  |  |  |  |
Series A Junior Participating Preferred Stock |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, par value |  |  | $ 0.01 |  |  |  |  |  |
Preferred stock, exercise price per right |  |  | $ 17.00 |  |  |  |  |  |

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