Aggregate dividends declared during the period for each share of common stock outstanding.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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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.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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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