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Shareholders' Equity - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2011 | Apr. 30, 2008 | Dec. 31, 2012 Vote | Sep. 30, 2012 | Jul. 01, 2012 | Apr. 01, 2012 | Dec. 31, 2012 Vote | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 05, 2008 Right
Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized shares |  |  | 400,000 |  |  |  | 400,000 |  |  |
Preferred stock issued |  |  | 0 |  |  |  | 0 |  |  |
Preferred stock Par value |  |  | $ 0.01 |  |  |  | $ 0.01 |  |  |
Vote entitled for each common share outstanding |  |  | 1 |  |  |  | 1 |  |  |
Number of preferred stock purchase right for dividend distribution |  |  |  |  |  |  |  |  |  | 1
Outstanding common share to be acquiring person |  |  | 15.00% |  |  |  | 15.00% |  |  |
Repurchase of authorized common stock | $ 80,000,000 | $ 50,000,000 |  |  |  |  |  |  |  |
Repurchase of shares |  |  | 1,375,875 |  |  |  | 1,375,875 |  |  |
Repurchase of shares, Value |  |  | 30,000,000 |  |  |  | 30,000,000 |  |  |
Remaining repurchase authorization amount | 20,000,000 |  |  |  |  |  |  |  |  |
Cash dividend declared per common share |  |  | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.10 |  |  |  |
Additional dividend declared and paid |  |  | $ 0.11 |  |  |  |  |  |  |
Special dividend declared and paid |  |  | $ 1.00 |  |  |  |  |  |  |
Payment of dividends |  |  |  |  |  |  | $ 66,213,000 | $ 15,114,000 | $ 10,014,000 |

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