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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |
Dividend declared and paid per share |  | $ 0.20
Aggregate dividend declared for the year |  | $ 3,600,000
Authorized to purchase of common stock under the stock repurchase program | $ 535,000,000 |
Cumulative repurchase of common stock | 16.3 | 0.1
Aggregate cost of repurchase of common stock | $ 474,900,000 | $ 4,400,000

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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