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Stockholders' Equity - Additional Information (Detail) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2015 | Apr. 13, 2015 | Jan. 13, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 02, 2014
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Treasury shares acquired |  |  |  | 100,000 | 200,000 |  |  |  |  |  |
Shares repurchased during period |  |  |  | $ 2,600,000 | $ 5,100,000 |  |  |  |  |  |
Amount of shares authorized to repurchase |  |  |  | $ 10,000,000 |  | $ 10,000,000 |  | $ 10,000,000 |  |  |
Dividends per share declared on outstanding common stock | $ 0.12 | $ 0.12 | $ 0.12 |  |  | $ 0.12 | $ 0.10 | $ 0.36 | $ 0.30 |  |
Contingently redeemable common stock, issued shares |  |  |  | 0 |  | 0 |  | 0 |  | 1,000,000 | 1,000,000
Redeemable Common Stock. price per share |  |  |  |  |  |  |  |  |  |  | $ 19.00
Installment1-FY2015 |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends payable date |  |  |  |  |  |  |  | Mar. 02, 2015 |  |  |
Dividends payable, shareholders record date |  |  |  |  |  |  |  | Feb. 18, 2015 |  |  |
Installment2-FY2015 |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends payable date |  |  |  |  |  |  |  | Jul. 02, 2015 |  |  |
Dividends payable, shareholders record date |  |  |  |  |  |  |  | Jun. 18, 2015 |  |  |
Installment3-FY2015 |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends payable date |  |  |  |  |  |  |  | Oct. 08, 2015 |  |  |
Dividends payable, shareholders record date |  |  |  |  |  |  |  | Sep. 23, 2015 |  |  |
Former Board Of Director S Chairman | Series M Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock repurchased, shares |  |  |  |  | 2,000 |  |  |  |  |  |
Stock repurchased and retired during period |  |  |  |  | $ 257,000 |  |  |  |  |  |

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- Definition Amount to be paid per share that is classified as temporary equity by entity upon redemption. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27011957&loc=d3e177068-122764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (27) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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