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Stock Compensation Plans - Additional Information (Detail) - shares
1 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2017
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)       865,349
Shares remaining available for future awards (in shares)       2,351,560
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)   47,267 73,134  
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] | Two Thousand Fourteen To Two Thousand Sixteen Cycle [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation, shares (in shares) 46,091