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Fair Value Measurements - Assets Categorized on Basis of Various Levels (Detail)
$ in Thousands
Jun. 30, 2015
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Money market fund deposits $ 10,942
Mutual fund investments 7
Total 10,949
Level 1 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Money market fund deposits 10,942
Mutual fund investments 7
Total $ 10,949