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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Apr. 30, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Feb. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Dividend declared and paid per share |  | $ 0.20 | $ 0.19 |
Aggregate dividend declared for the year |  | $ 3,600,000 | $ 3,500,000 |
Dividend declared per share |  | $ 0.20 | $ 0.19 |
Authorized to purchase of common stock under the stock repurchase program |  | $ 535,000,000 |  | $ 50,000,000
Repurchase of common Stock |  | 0.1 | 0.6 |
Cumulative aggregate cost of repurchase of common stock |  | $ 4,400,000 | $ 21,500,000 |
Cumulative repurchase of common stock |  | 16.2 |  |
Aggregate cost of repurchase of common stock |  | $ 469,300,000 |  |
Subsequent Event [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Dividend declared per share | $ 0.20 |  |  |
Dividend payable, date declared | 2018-04 |  |  |
Dividend declared payable date | Jun. 27, 2018 |  |  |
Dividend payable, record date | Jun. 13, 2018 |  |  |

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