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Stock Compensation Plans - Additional Information (Detail) - shares
1 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2016
Dec. 31, 2018
2010 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized for issuance (in shares)       1,500,000
Shares remaining available for issuance (in shares)       1,552,694
Shares subject to outstanding awards (in shares)       837,196
Shares remaining available for future awards (in shares)       1,927,617
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%
2008-2010 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%
2010-2012 Cycle [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation, shares (in shares)   46,091 47,267  
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%
Forecast [Member] | 2014-2016 Cycle [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation, shares (in shares) 25,394