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Stockholders' Equity - Common Stock (Detail) (USD $)	3 Months Ended								0 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Nov. 04, 2013 Common Stock [Member]	Jul. 31, 2013 Common Stock [Member]	May 02, 2013 Common Stock [Member]	Feb. 27, 2013 Common Stock [Member]	Nov. 02, 2012 Common Stock [Member]	Aug. 06, 2012 Common Stock [Member]	May 03, 2012 Common Stock [Member]	Feb. 28, 2012 Common Stock [Member]
Class of Stock [Line Items]
Dividend Amount	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: 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

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