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Dividends Declared Per Share (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Dividends Payable [Line Items]
Dividend Amount	$ 0.69	$ 0.69
Group One
Dividends Payable [Line Items]
Declaration Date	Mar. 28, 2013
Date Paid (Payable)	May 15, 2013
Shareholder of Record Date	May 01, 2013
Dividend Amount	$ 0.345
Group Two
Dividends Payable [Line Items]
Declaration Date	Jan. 17, 2013
Date Paid (Payable)	Feb. 15, 2013
Shareholder of Record Date	Feb. 01, 2013
Dividend Amount	$ 0.345
Group Three
Dividends Payable [Line Items]
Declaration Date	Sep. 19, 2012
Date Paid (Payable)	Nov. 15, 2012
Shareholder of Record Date	Nov. 01, 2012
Dividend Amount	$ 0.345
Group Four
Dividends Payable [Line Items]
Declaration Date	Jun. 06, 2012
Date Paid (Payable)	Aug. 15, 2012
Shareholder of Record Date	Aug. 01, 2012
Dividend Amount	$ 0.345
Group Five
Dividends Payable [Line Items]
Declaration Date	Mar. 22, 2012
Date Paid (Payable)	May 15, 2012
Shareholder of Record Date	May 01, 2012
Dividend Amount	$ 0.345
Group Six
Dividends Payable [Line Items]
Declaration Date	Jan. 17, 2012
Date Paid (Payable)	Feb. 15, 2012
Shareholder of Record Date	Feb. 01, 2012
Dividend Amount	$ 0.345

X

- 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=6959260&loc=d3e187085-122770

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 32

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
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X

- Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration