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Fair Value Measurements - Additional Information (Detail)
3 Months Ended
Jun. 30, 2020
USD ($)
unit_Contract
Jun. 30, 2020
CAD ($)
unit_Contract
Jun. 30, 2020
GBP (£)
unit_Contract
Jun. 30, 2019
USD ($)
Derivative [Line Items]        
Significant transfers from level 1 to level 2 $ 0     $ 0
Significant transfers from level 2 to level 1 $ 0     $ 0
British pound forward contracts | unit_Contract 4 4 4  
Foreign Exchange Forward | Canada, Dollars        
Derivative [Line Items]        
Derivative, notional amount   $ 24,000,000.0    
Fair value unrealized gain (loss) $ 100,000      
Foreign Exchange Forward | United Kingdom, Pounds        
Derivative [Line Items]        
Derivative, notional amount | £     £ 40,000,000.0  
Fair value unrealized gain (loss) $ 800,000