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Shareholders' Equity - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 04, 2015 $ / shares | Jul. 05, 2015 $ / shares | Dec. 31, 2014 $ / shares | Dec. 31, 2015 USD ($) Vote $ / shares shares | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Nov. 01, 2015 USD ($) | Aug. 03, 2015 USD ($) | Apr. 29, 2014 USD ($) | Dec. 05, 2008 Right
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized shares | shares |  |  |  | 400,000 |  |  |  |  |  |
Preferred stock Par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 |  |  |  |  |  |
Vote entitled for each common share outstanding | Vote |  |  |  | 1 |  |  |  |  |  |
Number of preferred stock purchase right for dividend distribution | Right |  |  |  |  |  |  |  |  |  | 1
Outstanding common share to be acquiring person |  |  |  | 15.00% |  |  |  |  |  |
Stock Repurchased During Period, Value |  |  |  | $ 126,351,000 | $ 59,673,000 | $ 47,908,000 |  |  |  |
Cash dividend declared per common share | $ / shares | $ 0.07 | $ 0.07 | $ 0.07 |  |  |  |  |  |  |
Payments of Dividends |  |  |  | $ 18,062,000 |  |  |  |  |  |
Repurchase Program 2014 [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
total shares repurchased | shares |  |  |  | 1,079,000 |  |  |  |  |  |
Stock Repurchased During Period, Shares | shares |  |  |  | 895,000 |  |  |  |  |  |
Stock Repurchased During Period, Value |  |  |  | $ 42,415,000 |  |  |  |  |  |
Repurchase Program 2015 [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase of authorized common stock |  |  |  |  |  |  |  | $ 100,000,000 |  |
Stock Repurchased During Period, Shares | shares |  |  |  | 2,311,000 |  |  |  |  |  |
Stock Repurchased During Period, Value |  |  |  | $ 83,936,000 |  |  |  |  |  |
Repurchase Program November 2015 [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase of authorized common stock |  |  |  |  |  |  | $ 100,000,000 |  |  |
Common Stock [Member] | Repurchase Program 2014 [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase of authorized common stock |  |  |  |  |  |  |  |  | $ 50,000,000 |
Repurchased shares, total cost |  |  |  | $ 50,000,000 |  |  |  |  |  |

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