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Shareholders' Equity - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 30, 2017 | Feb. 28, 2018 USD ($) shares | Dec. 31, 2018 USD ($) Vote $ / shares shares | Sep. 30, 2018 USD ($) $ / shares | Apr. 01, 2018 USD ($) shares | Dec. 31, 2017 $ / shares shares | Apr. 02, 2017 $ / shares | Dec. 31, 2018 USD ($) Vote $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) | Apr. 25, 2018 shares | Feb. 01, 2018 USD ($) | Oct. 31, 2017 $ / shares | Apr. 12, 2017 USD ($) | Apr. 28, 2016 shares | Apr. 27, 2016 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized shares | shares |  |  | 400,000 |  |  |  |  | 400,000 |  |  |  |  |  |  |  |
Preferred stock par value (in dollars per share) | $ / shares |  |  | $ 0.01 |  |  |  |  | $ 0.01 |  |  |  |  |  |  |  |
Common stock, shares authorized | shares |  |  | 300,000,000 |  |  | 200,000,000 |  | 300,000,000 | 200,000,000 |  | 300,000,000 |  |  |  | 10,000,000 | 200,000,000
Stock split | 2 |  |  |  |  | 2 |  |  | 2 |  |  |  |  |  |  |
Common stock par value, in dollars per share | $ / shares |  |  | $ 0.002 |  |  | $ 0.002 |  | $ 0.002 | $ 0.002 |  |  |  | $ 0.002 |  |  |
Vote entitled for each common share outstanding | Vote |  |  | 1 |  |  |  |  | 1 |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  | $ 203,822,000 | $ 123,715,000 | $ 47,149,000 |  |  |  |  |  |
Cash dividend declared per common share | $ / shares |  |  | $ 0.0500 | $ 0.0425 |  | $ 0.0450 | $ 0.0375 |  |  |  |  |  |  |  |  |
Payments of dividends |  |  |  |  |  |  |  | 31,865,000 | $ 29,037,000 |  |  |  |  |  |  |
Repurchase Program 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
total shares repurchased | shares |  |  |  |  | 1,744,000 |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock, shares | shares |  |  |  |  | 803,000 |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  | $ 45,200,000 |  |  |  |  |  |  |  |  |  |  |
Repurchase Program 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of authorized common stock |  |  | $ 191,378,000 |  |  |  |  | $ 191,378,000 |  |  |  |  |  | $ 100,000,000 |  |
Repurchase of common stock, shares | shares |  | 3,174,000 |  |  |  |  |  | 203,000 |  |  |  |  |  |  |  |
Repurchase of common stock |  | $ 150,000,000 |  |  |  |  |  | $ 8,622,000 |  |  |  |  |  |  |  |
Repurchase Program November 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of authorized common stock |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  | $ 150,000,000 |  |  |  |
Common Stock [Member] | Repurchase Program 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased shares, total cost |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |

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