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Shareholder Rights Plan - Additional Information (Detail) (USD $) |  |  | 12 Months Ended |  |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Shareholder Rights Plan Two Thousand Eight | Dec. 31, 2012 Shareholder Rights Plan Two Thousand Eight Minimum | Apr. 04, 2008 Shareholder Rights Plan Two Thousand Eight Minimum | Dec. 31, 2012 Shareholder Rights Plan Two Thousand Eight Series B Junior Participating Preferred Stock
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |
Shareholders rights plan exercisability percentage of common stock acquired |  |  |  |  | 15.00% |
Shareholders rights plan exercise percentage of voting stock ownership offer |  |  |  |  | 15.00% |
Exercise price per right |  |  | $ 75.00 |  |  |
Redemption price per right |  |  | $ 0.01 |  |  |
Percentage of beneficial ownership |  |  |  | 50.00% |  |
Preferred stock , par value | $ 0.01 | $ 0.01 |  |  |  | $ 0.01
Preferred stock reserved for issuance upon exercise of the rights |  |  |  |  |  | 175,000

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- Definition Aggregate number of nonredeemable preferred shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 3, 4, 5, 6, 7, 8 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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