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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

X

- Definition

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

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The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Date the declared dividend will be paid, in CCYY-MM-DD format.

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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Number of shares issued during the period as a result of the conversion of convertible securities.

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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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