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CONTINGENCIES AND COMMITMENTS - Additional Information (Detail) (Forecast, USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015
Loss Contingencies [Line Items] |
Monthly dividend declared (in dollars per share) | $ 0.005 grow_MonthlyDeclaredDividend
Class A and C shareholders |
Loss Contingencies [Line Items] |
Amount of cash dividends to be paid to class A and class C shareholders | $ 231 grow_DeclaredDividends / us-gaap_StatementClassOfStockAxis = grow_ClassAandCMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

X
- Definition Dividends declared but unpaid on equity securities issued by the entity and outstanding. + References No definition available. + Details
Name: | grow_DeclaredDividends
Namespace Prefix: | grow_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Monthly declared dividend per share. + References No definition available. + Details
Name: | grow_MonthlyDeclaredDividend
Namespace Prefix: | grow_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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