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Dividends - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Mar. 31, 2012 | Jun. 30, 2012 | Jun. 30, 2011
Dividends [Line Items] |  |  |  |
Total cash dividend paid | $ 10,956,000 | $ 10,847,000 | $ 21,803,000 | $ 20,902,000
Dividend record date | Apr. 27, 2012 | Feb. 24, 2012 | Jul. 27, 2012 |
Dividend per common share to be paid | $ 0.16250 | $ 0.16125 | $ 0.16375 |
Dividend declared date |  |  | Jul. 10, 2012 |
Dividend payable date |  |  | Aug. 24, 2012 |

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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=6959260&loc=d3e187085-122770 + Details
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- 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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