Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Additional Information (Detail)

v3.10.0.1
Stock-Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Stock Compensation Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock based compensation (income) expense $ 260,000 $ (67,000)
Income tax (expense) benefit to stock based compensation $ 58,000 $ (23,000)
Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options maximum term 10 years  
Amended and Restated 2000 Incentive Plan [Member] | Stock Compensation Plan [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized 1,375,000  
Amended and Restated 2000 Incentive Plan [Member] | Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock awarded 53,000 59,000
Amended and Restated 2000 Incentive Plan [Member] | Restricted Stock [Member] | Performance Vested Restricted Stock [Member] | Officer [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock awarded 27,000 30,000
Share-based compensation vesting percentage 100.00%  
Vesting period 3 years  
Amended and Restated 2000 Incentive Plan [Member] | Restricted Stock [Member] | Time Vested Restricted Stock [Member] | Officers and Key Employees [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock awarded 20,000 22,000
Share-based compensation vesting percentage 33.33%  
Vesting period 3 years  
Amended and Restated 2000 Incentive Plan [Member] | Restricted Stock [Member] | Time Vested Restricted Stock [Member] | Director [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock awarded 6,000 7,000
Share-based compensation vesting percentage 100.00%  
Vesting period 1 year  
Amended and Restated 2000 Incentive Plan [Member] | Restricted Stock [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized 467,000  
Amended and Restated 2000 Incentive Plan [Member] | Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock option awards granted 0 0
Employee Stock Purchase Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum discount on purchase price of common stock percentage on fair market value 15.00%  
Common stock may be purchased 200  
Stock based compensation expense $ 0 $ 0