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Fair Value Measurements - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2014
Mar. 31, 2014
Sep. 30, 2014
Mar. 31, 2014
Blade Dynamics Ltd.
       
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Impairment charge on investment $ 3,500,000 $ 1,300,000 $ (3,464,000) $ 1,300,000
Convertible Notes
       
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Debt, face amount   $ 25,000,000   $ 25,000,000
Debt Instrument, Interest Rate, Stated Percentage   7.00%   7.00%