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Changes in Preferred Stock, Common Stock and Treasury Stock (Detail) | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Feb. 28, 2011 | Dec. 31, 2013 Preferred Stock | Dec. 31, 2012 Preferred Stock | Dec. 31, 2011 Preferred Stock | Dec. 31, 2010 Preferred Stock | Dec. 31, 2013 Common Stock | Dec. 31, 2012 Common Stock | Dec. 31, 2011 Common Stock | Dec. 31, 2013 Treasury Stock | Dec. 31, 2012 Treasury Stock | Dec. 31, 2010 Treasury Stock
Stock Option Activity And Changes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 2,600,000 | 2,600,000 |  |  | 44,300,000 | 43,800,000 | 42,900,000 | 400,000 | 300,000 | 300,000
Common stock repurchases | 600,000 |  |  |  |  |  |  |  |  |  | 600,000 |  |
Stock-based compensation |  |  |  |  |  |  |  | 800,000 | 500,000 | 900,000 | 100,000 | 100,000 |
Sale of preferred stock | 2,600,000 | 2,600,000 | 2,587,500 |  |  | 2,600,000 |  |  |  |  |  |  |
Ending Balance |  |  |  | 2,600,000 | 2,600,000 |  |  | 45,100,000 | 44,300,000 | 43,800,000 | 1,100,000 | 400,000 | 300,000

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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition Number of shares issued which are neither cancelled nor held in the treasury. + References No definition available. + Details
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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: 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=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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