Financial Instruments - Additional Information (Detail)	Jun. 30, 2020
Measurement Input, Discount Rate | Probability Weighted
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.135
Measurement Input, Discount Rate | Monte Carlo
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.136
Measurement Input, Price Volatility | Monte Carlo
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.300