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Loss Per Share - Shares Excluded from Computation of Diluted Loss Per Share (Detail)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Antidilutive Securities [Line Items]        
Anti-dilutive potential common shares 7.2 5.3 8.2 4.4
Stock Options [Member]
       
Antidilutive Securities [Line Items]        
Anti-dilutive potential common shares 4.7 4.9 5.7 4.0
Restricted Stock Units (RSUs) [Member]
       
Antidilutive Securities [Line Items]        
Anti-dilutive potential common shares 2.2 0 2.2 0
Warrants [Member]
       
Antidilutive Securities [Line Items]        
Anti-dilutive potential common shares 0.3 0.4 0.3 0.4