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BUSINESS COMBINATION - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Jun. 01, 2014
Mar. 31, 2013
Schedule of Equity Method Investments [Line Items]            
Gain (loss) in earnings of Galileo $ 0us-gaap_IncomeLossFromEquityMethodInvestments $ 30us-gaap_IncomeLossFromEquityMethodInvestments $ 0us-gaap_IncomeLossFromEquityMethodInvestments $ 15us-gaap_IncomeLossFromEquityMethodInvestments    
Galileo Global Equity Advisor Inc            
Schedule of Equity Method Investments [Line Items]            
Percentage of shares issued and outstanding of Galileo           50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= grow_GalileoGlobalEquityAdvisorIncMember
Purchase of Galileo shares           600us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= grow_GalileoGlobalEquityAdvisorIncMember
Purchase of additional equity shares         15.00%grow_SubsidiaryorEquityMethodInvesteeAdditionalPercentageOwnershipAcquired
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= grow_GalileoGlobalEquityAdvisorIncMember
 
Payments to acquire additional interest in subsidiary         180us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= grow_GalileoGlobalEquityAdvisorIncMember
 
Percentage of shares issued and outstanding of Galileo         65.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= grow_GalileoGlobalEquityAdvisorIncMember
 
Other income | Galileo Global Equity Advisor Inc            
Schedule of Equity Method Investments [Line Items]            
Gain (loss) in earnings of Galileo   $ 30us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= grow_GalileoGlobalEquityAdvisorIncMember
  $ 15us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= grow_GalileoGlobalEquityAdvisorIncMember