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Stockholders' Equity - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 26, 2014 | Apr. 16, 2014 | Jan. 30, 2014 | Sep. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2013 | Jun. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Oct. 01, 2014 Subsequent Event | Sep. 30, 2014 Series M [Member] | Sep. 30, 2014 Series A [Member] | Sep. 30, 2014 Former Board of Directors Chairman [Member] | Sep. 30, 2014 Maximum [Member] Former Board of Directors Chairman [Member]
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury shares acquired |  |  |  |  |  |  |  | 1,166,208 |  |  |  |  | 1,225,000 |
Shares repurchased during period |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  | $ 14,700,000 |
Percentage of stock owned by Mr. Meier |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00%
Conversion of preferred shares into common stock |  |  |  |  |  |  |  |  |  |  | 8,000 | 9,975 |  |
Common stock issued as a result of conversion |  |  |  |  |  |  |  | 64,938 |  |  |  |  |  |
Dividends per share declared on outstanding common stock | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.10 |  | $ 0.10 |  | $ 0.30 | $ 0.26 |  |  |  |  |
Dividends payable date |  |  |  |  | Mar. 03, 2014 |  | Jul. 03, 2014 | Oct. 01, 2014 |  |  |  |  |  |
Dividends payable, shareholders record date |  |  |  |  | Feb. 19, 2014 |  | Jun. 19, 2014 | Sep. 23, 2014 |  |  |  |  |  |
Payments Of Dividends Common Stock |  |  |  |  |  |  |  | $ 6,967,000 | $ 9,576,000 | $ 3,400,000 |  |  |  |

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