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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation (in shares) 7,608 3,173 7,608 3,173
Common stock purchase warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation (in shares) 5,632 1,117 5,632 1,117
Stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation (in shares) 1,892 1,933 1,892 1,933
Restricted shares of common stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation (in shares) 84 123 84 123