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ETF Shareholder Proxy Solicitation - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Equity [Abstract] |
Percentage of common stock own by beneficial owner | 25.50%
Reduced percentage of common stock owned by beneficial owner due to sell or transfer | 25.00%
Threshold percentage of ownership presumes change in control | 25.00%
ETF shareholders proxy | $ 3,264

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- Details
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