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Stockholders' Equity - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2018 | May 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Feb. 28, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value |  |  | $ 0.01 |  |  |  |  |  | $ 0.01 |  |  | $ 0.01
Dividend declared and paid per share |  |  | 0.20 | $ 0.20 | $ 0.20 | $ 0.19 | $ 0.19 | $ 0.19 |  |  |  |
Aggregate dividend declared for the year |  |  |  |  |  |  |  |  | $ 10,800,000 | $ 10,200,000 |  |
Dividend declared per share |  |  | $ 0.20 |  |  | $ 0.19 |  |  | $ 0.60 | $ 0.57 |  |
Authorized to purchase of common stock under the stock repurchase program |  |  | $ 535,000,000 |  |  |  |  |  | $ 535,000,000 |  | $ 50,000,000 |
Repurchase of common Stock |  |  |  |  |  | 100,000 |  |  | 200,000 | 1,100,000 |  |
Cumulative aggregate cost of repurchase of common stock |  |  | $ 300,000 |  |  | $ 3,500,000 |  |  | $ 10,000,000 | $ 40,000,000 |  |
Cumulative repurchase of common stock |  |  | 16,300,000 |  |  |  |  |  | 16,300,000 |  |  |
Aggregate cost of repurchase of common stock |  |  |  |  |  |  |  |  | $ 474,900,000 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared per share | $ 0.20 |  |  |  |  |  |  |  |  |  |  |
Dividend payable, date declared | 2018-10 |  |  |  |  |  |  |  |  |  |  |
Dividend declared payable date | Dec. 26, 2018 |  |  |  |  |  |  |  |  |  |  |
Dividend payable, record date | Dec. 12, 2018 |  |  |  |  |  |  |  |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of additional shares to be granted |  | 400,000 |  |  |  |  |  |  |  |  |  |
Common stock, par value |  | $ 0.01 |  |  |  |  |  |  |  |  |  |

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