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Subsequent Events - Additional Information (Detail) (Forecast, Galileo Global Equity Advisor Inc) | 3 Months Ended
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Jun. 30, 2014
Forecast | Galileo Global Equity Advisor Inc |
Subsequent Event [Line Items] |
Purchase of additional equity shares | 15.00%
Percentage of shares issued and outstanding of Galileo | 65.00%

X
- Definition Controlling Interest, Ownership Percentage by Parent + References No definition available. + Details
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Namespace Prefix: | grow_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Equity Method Investment, Additional Ownership Percentage + References No definition available. + Details
Name: | grow_EquityMethodInvestmentAdditionalOwnershipPercentage
Namespace Prefix: | grow_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration