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Organization and Description of Business - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2006
Fund
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Fund
Sep. 30, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Number of ETF launched by the company 20        
Number of ETF had by Company       53  
Amount of assets under management   $ 8,794 $ 5,671 $ 26,123 $ 16,677
Exchange Traded Funds [Member]
          
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Amount of assets under management       $ 31,400,000