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CONTINGENCIES AND COMMITMENTS - Additional Information (Detail) (Forecast, USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Jun. 30, 2015
Loss Contingencies [Line Items]  
Monthly dividend declared (in dollars per share) $ 0.005grow_MonthlyDeclaredDividend
Class A and C shareholders
  
Loss Contingencies [Line Items]  
Amount of cash dividends expected to be paid to class A and class C shareholders $ 231grow_DeclaredDividends
/ us-gaap_StatementClassOfStockAxis
= grow_ClassAandCMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember