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Stock Based Compensation and Stock Options - Additional Information (Detail) (USD $)
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]        
Common stock grants 19,365,500   19,365,500  
Stock options vested, percent     25.00%  
Remaining vested options, percent     75.00%  
Options expected forfeiture rate, percentage 12.40% 12.85%    
Stock-based compensation expense     $ 1,546,000 $ 650,000
Weighted-average grant-date fair value of options granted $ 16.70 $ 17.05    
Recognized stock compensation expense 285,000 0 448,000 0
Employee [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-statutory stock options expiration period     5 years  
Director [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-statutory stock options expiration period     10 years  
Time Based Options [Member] | Performance Based Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 676,000 $ 263,000 $ 1,546,000 $ 650,000
Minimum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-statutory stock options vesting period     1 year  
Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-statutory stock options vesting period     36 months