Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share - Summary of Anti-Dilutive Equivalent Units Outstanding Excluded From Calculation of Earnings Per Share (Detail)

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Earnings Per Share - Summary of Anti-Dilutive Equivalent Units Outstanding Excluded From Calculation of Earnings Per Share (Detail) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from calculation (in shares) 6,388 3,146
Common stock purchase warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from calculation (in shares) 4,362 1,136
Stock options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from calculation (in shares) 1,928 1,888
Restricted shares of common stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from calculation (in shares) 98 122