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Stock Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Allocated Stock compensation expense $ 707 $ 7,302
Product development
   
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Allocated Stock compensation expense   69
General and administrative
   
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Allocated Stock compensation expense $ 707 $ 7,233