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Stockholders' Equity - Additional Information (Detail) - USD ($) | Oct. 24, 2018 | Sep. 30, 2018 | Jul. 25, 2018 | Sep. 06, 2013
--- | --- | --- | --- | ---
2013 program |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Amount approved for repurchases under stock buyback program |  |  | $ 250,000,000 |
Remaining amount approved for repurchases under stock buyback program |  | $ 200,000,000 |  |
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 | Oct. 24, 2018 |  |  |
Dividend per share, declared | $ 0.04 |  |  |
Dividend payment date | Dec. 20, 2018 |  |  |
Dividend record date | Dec. 06, 2018 |  |  |

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