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Earnings Per Share - Additional Information (Detail)
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3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Dec. 31, 2011
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| Earnings Per Share [Line Items] | |||||
| Average number of shares outstanding | 11,056,999 | 11,432,209 | 11,111,490 | 11,453,124 | |
| Number of shares outstanding | 11,057,052 | 11,057,052 | 11,309,365 | ||