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Earnings Per 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
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Outstanding stock awards excluded from calculation of diluted earnings (loss) per share 7 7 7 7