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Subsequent Event - Dividend Declaration - Additional Information (Detail) (Subsequent Event, USD $) | 3 Months Ended | 12 Months Ended
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Feb. 12, 2013 | Dec. 31, 2012
Subsequent Event |  |
Subsequent Event [Line Items] |  |
Cash Dividends declared per common share | $ 0.21 |
Dividend Payable Date |  | Mar. 15, 2013

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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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Period Type: | duration

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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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Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration