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Performance Based Restricted Stock Awards (Detail) (Performance-Based Restricted Stock)
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6 Months Ended |
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Jun. 30, 2012
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Performance-Based Restricted Stock
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Non-vested awards outstanding at beginning balance | 101,730 |
| Awards granted | 22,120 |
| Stock issued | (43,750) |
| Awards forfeited | (6,642) |
| Non-vested awards outstanding ending balance | 73,458 |