Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Additional Information (Detail)

v2.4.0.8
Stock-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized 1,375   1,375  
Restricted Stock Units (RSUs) [Member] | Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized 250   250  
Employee Stock Option [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options maximum term     10 years  
Stock option awards granted 0 0 0 49
Share-based compensation vesting percentage     33.33%  
Stock vesting period     3 years  
Stock Compensation Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 134 $ 131 $ 447 $ 423
Income tax benefit to stock-based compensation 47 46 157 149
Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock awards 0 0 32 26
Performance Vested Restricted Stock [Member] | Officer [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation vesting percentage     100.00%  
Restricted stock awards     14 18
Period of performance metrics     3 years  
Time Vested Restricted Stock [Member] | Officers and Key Employees [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation vesting percentage     33.33%  
Stock vesting period     3 years  
Restricted stock awards     12  
Time Vested Restricted Stock [Member] | Director [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation vesting percentage     100.00%  
Restricted stock awards     6 8
Employee Stock Purchase Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 14 13 42 40
Income tax benefit to stock-based compensation $ 5 $ 5 $ 14 $ 13
Discounted purchase price of common stock percentage on fair market value     85.00%  
Shares approved for purchase under ESPP 200   200