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Stockholders' Equity - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |
Dividend declared and paid per share |  |  | $ 0.20
Aggregate dividend declared for the year |  |  | $ 7,200,000
Authorized to purchase of common stock under the stock repurchase program |  | $ 535,000,000 |
Repurchase of common stock | 100,000 | 0 | 200,000
Aggregate cost of repurchase of common stock | $ 5,300,000 | $ 474,900,000 | $ 9,600,000
Cumulative repurchase of common stock |  | 16,300,000 |

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