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Repurchases of Common Shares (Detail) - 3 months ended Jun. 30, 2015 - USD ($)
Total
Number of Shares 574,467
Amount [1] $ 4,239,216
2015 Repurchase Plan  
Number of Shares 574,467
Weighted Average Price Per Share $ 7.38
Amount [1] $ 4,239,216
[1] Amount excludes commission fees.