v2.4.0.6

Summary of Dividends Declared (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012 Q1 2012	Sep. 30, 2012 Q2 2012	Sep. 30, 2012 Q3 2012	Sep. 30, 2011 Q1 2011	Sep. 30, 2011 Q2 2011	Sep. 30, 2011 Q3 2011
Dividends Payable [Line Items]
Declaration Date	Feb. 09, 2012	Apr. 25, 2012	Jul. 25, 2012	Feb. 09, 2011	Apr. 27, 2011	Jul. 26, 2011
Dividend Per Share	$ 0.09	$ 0.09	$ 0.13	$ 0.14	$ 0.14	$ 0.14
Record Date	Mar. 12, 2012	May 30, 2012	Aug. 28, 2012	Mar. 11, 2011	May 27, 2011	Aug. 26, 2011
Total Amount	$ 12,204	$ 12,205	$ 18,061	$ 19,352	$ 19,232	$ 19,148
Payment Date	Mar. 30, 2012	Jun. 19, 2012	Sep. 18, 2012	Mar. 31, 2011	Jun. 17, 2011	Sep. 16, 2011

X

- Definition

Dividends Declared, Date Paid, Month, Day and Year.

+ References

No definition available.

+ Details

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X

- Definition

The aggregate amount of dividends paid during the period.

+ References

No definition available.

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X

- Definition

Aggregate dividends paid 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

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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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- Definition

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

+ References

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