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Common Shareholders' Equity - Additional Information (Detail) (USD $)
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1 Months Ended | 3 Months Ended | 9 Months Ended | 15 Months Ended | 18 Months Ended | |
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Dec. 31, 2011
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Jun. 30, 2013
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Jun. 30, 2013
vote
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2013
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| Stockholders Equity Note [Line Items] | ||||||
| Number of voting right per share | 1 | |||||
| Common Stock, Dividends, Per Share, Declared | $ 0.10 | $ 0.30 | $ 0.20 | $ 0.10 | ||
| Cash dividend | $ (7,356,000) | |||||
| Repurchase of common stock authorized by Board of Directors | 25,000,000 | |||||
| Purchased shares | 556,900 | 700,500 | ||||
| Average price per share | $ 9.61 | $ 10.27 | ||||
| Aggregate cost of treasury stock repurchased during the period | 5,400,000 | 7,200,000 | ||||
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Common Stock
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| Stockholders Equity Note [Line Items] | ||||||
| Common Stock, Dividends, Per Share, Declared | $ 0.30 | $ 0.10 | $ 0.10 | |||
| Cash dividend | $ 7,400,000 | |||||