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Dividends - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 1 Months Ended
--- | --- | --- | ---
Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Nov. 08, 2012 Subsequent Event Dividend Declared
Dividends Payable [Line Items] |  |  |  |  |  |  |
Cash dividend paid, per share amount | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.11 | $ 0.36 | $ 0.33 |
Dividends paid on common stock |  |  |  |  | $ 25,371,000 | $ 23,361,000 |
Cash dividend declared per share amount |  |  |  |  |  |  | $ 0.12
Cash dividend payable date |  |  |  |  |  |  | Dec. 17, 2012
Dividend payable, date of record for common stock holders |  |  |  |  |  |  | Dec. 03, 2012
Expected payment of quarterly dividend |  |  |  |  |  |  | $ 8,400,000

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