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Fair Value Measurements - Assets Categorized on Basis of Various Levels (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements $ 7,384
Cash and Cash Equivalents [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements 7,377
Investments in Marketable Securities [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements 7
Money Market Fund Deposits [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements 7,377
Mutual Fund Investments [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements 7
Level 1 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements 7,384
Level 1 [Member] | Cash and Cash Equivalents [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements 7,377
Level 1 [Member] | Investments in Marketable Securities [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements 7
Level 1 [Member] | Money Market Fund Deposits [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements 7,377
Level 1 [Member] | Mutual Fund Investments [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements 7
Level 2 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements   
Level 2 [Member] | Cash and Cash Equivalents [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements   
Level 2 [Member] | Investments in Marketable Securities [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements   
Level 2 [Member] | Money Market Fund Deposits [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements   
Level 2 [Member] | Mutual Fund Investments [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements   
Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements   
Level 3 [Member] | Cash and Cash Equivalents [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements   
Level 3 [Member] | Investments in Marketable Securities [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements   
Level 3 [Member] | Money Market Fund Deposits [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements   
Level 3 [Member] | Mutual Fund Investments [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value measurements