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Stockholder's Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 6 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | ---
Mar. 01, 2014 | Jun. 30, 2014 | Mar. 01, 2014 | Dec. 10, 2012 Board of Directors Maximum
Schedule Of Stockholders Equity [Line Items] |  |  |  |
Common stock repurchase authorized amount |  |  |  | $ 50
Common stock repurchased, shares |  | 552,806 |  |
Common stock repurchased, value |  | 14.0 |  |
Remaining authorized shares available for future repurchases |  | 24.3 |  |
Sale of preferred stock |  |  | 2,587,400 |
Convertible preferred stock dividend, rate | 6.25% |  |  |
Conversion rate of preferred stock |  |  | 6,912,756 |
Convertible preferred stock, conversion date | Mar. 01, 2014 |  |  |
Annualized dividend on mandatory convertible preferred stock |  | $ 16.2 |  |

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- Definition Number of shares issued for each share of convertible preferred stock that is converted. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 + Details
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