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Earnings Per Common Share - Additional Information (Detail) (USD $) | 9 Months Ended
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Sep. 30, 2012
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |
Conversion price of Convertible Notes, per share | 31.25
3 3/4% Senior Subordinated Convertible Notes Due 2012 |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |
Convertible notes maturity date | Jul. 15, 2012
Senior subordinated convertible notes, interest percentage | 3.75%

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