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(Loss) Income Per Common Share - Additional Information (Detail) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Restricted Stock Liability Awards        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Stock excluded from earning per share calculation 2.8 2.8 2.8 2.8