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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The percentage rate used to calculate dividend payments on preferred stock.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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Equity Transactions - Additional Information (Detail) - $ / shares			3 Months Ended
	May 01, 2018	Feb. 14, 2018	Mar. 31, 2018	Mar. 31, 2017
Equity, Class of Treasury Stock [Line Items]
Common stock cash dividends declared per share (in $ per share)		$ 0.45	$ 0.45	$ 0.45
Preferred stock cash dividends declared per share (in $ per share)			$ 1.8125	$ 1.8125
Repurchases of common shares (in shares)			0
Shares available for repurchase (in shares)			883,756
Shares authorized for repurchase (in shares)			4,180,045
Public offering 1 \| Convertible preferred stock
Equity, Class of Treasury Stock [Line Items]
Convertible preferred stock dividend rate			7.25%
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Preferred stock cash dividends declared per share (in $ per share)	$ 1.8125