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Computation of Net (Loss) Income Per Common Share - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive shares excluded from calculation of diluted EPS 7.4 10.6
Unexercised Options
   
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive shares excluded from calculation of diluted EPS 3.9  
Unvested Options
   
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive shares excluded from calculation of diluted EPS   2.9
Warrants
   
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive shares excluded from calculation of diluted EPS 3.5 3.2
Convertible Notes
   
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive shares excluded from calculation of diluted EPS   4.5