| 
           Subsequent Events (Details) (USD $) 
         | 
        6 Months Ended | 0 Months Ended | 0 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 
           Dec. 31, 2013 
         | 
        
           Dec. 31, 2012 
         | 
        
           Feb. 26, 2014
 
          Subsequent Event 
         | 
        
           Feb. 12, 2014
 
          Subsequent Event 
         | 
        
           Feb. 26, 2014
 
          Subsequent Event
 
          First Closing 
         | 
        
           Feb. 26, 2014
 
          Subsequent Event
 
          Second Closing 
         | 
        
           Feb. 12, 2014
 
          Subsequent Event
 
          Second Closing 
         | 
        
           Feb. 26, 2014
 
          Subsequent Event
 
          A-Mark
 
          Second Closing 
         | 
        
           Feb. 26, 2014
 
          Subsequent Event
 
          Auctentia and Afinsa
 
          First Closing 
         | 
        
           Feb. 26, 2014
 
          Subsequent Event
 
          Afinsa 
         | 
        
           Feb. 26, 2014
 
          Subsequent Event
 
          Auctentia SL 
         | 
      |
| Subsequent Event [Line Items] | |||||||||||
| Dividends declared | $ 5,000,000 | ||||||||||
| Dividends paid | 5,000,000 | 15,000,000 | 5,000,000 | ||||||||
| Shares purchased (in shares) | 44,163.76 | 2,988,106.36 | |||||||||
| Shares purchased, value | $ 6,400,000 | $ 1,000,000 | $ 2,200,000 | ||||||||
| Share Price (in USD per share) | $ 2.10 | ||||||||||
| Percentage of shares purchased from shareholder | 50.00% | 50.00% | |||||||||
| Share purchase interest rate | 4.00% | ||||||||||
| Shares repurchased (in shares) | 379,033 | ||||||||||
| Cost per share (in USD per share) | $ 5.80 | ||||||||||
| X | ||||||||||
| 
             
- Definition 
          Percentage of Shares Purchased from Shareholder No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Purchase Agreement, Share Purchase Interest Rate No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Purchase Agreement, Shares Purchased No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Purchase Agreement, Shares Purchased, Value No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Equity impact of common stock cash dividends declared by an entity during the period. This element includes paid and unpaid dividends declared during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Price of a single share of a number of saleable stocks of a company. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Details 
          
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Total cost of shares repurchased divided by the total number of shares repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  |