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Stock Compensation Plans - Additional Information (Detail) - shares
1 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2020
2015 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized for issuance (in shares)       1,500,000
2010 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares remaining available for issuance (in shares)       1,552,694
Shares subject to outstanding awards (in shares)       986,105
Shares remaining available for future awards (in shares)       967,650
Long-Term Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period, in years       3 years
Target payout percentage, cash       50.00%
Target payout percentage, stock       50.00%
2008-2020 Cycle (Cycle VIII) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of target dollar value of the award converted to a number of notional shares       50.00%
2016-2018 Cycle [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation, shares (in shares)     25,394  
2017 - 2019 Cycle [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation, shares (in shares)   14,579    
2018-2020 Cycle [Member] | Subsequent Event [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation, shares (in shares) 7,484      
RSU's [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period, in years       3 years
Each twelve-month period [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage       25.00%
Full three-year period [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage       25.00%