| 
           Investments and Fair Value Measurements - Category of Financial Instruments Not Held at Fair Value (Parenthetical) (Detail) (Money Market Funds, USD $) 
         | 
        
           Jun. 30, 2014 
         | 
      
|---|---|
| 
           Money Market Funds 
         | 
        |
| Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] | |
| Quoted market price | $ 1.00 | 
| X | ||||||||||
| 
             
- Definition 
          Quoted market price per common share. No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Details 
          
  |