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Earnings (Loss) Per Share - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Common Stock And Eps [Line Items]        
Securities excluded from calculation of basic and diluted earnings per share 8.0 5.9 6.3 5.4
Average stock price     $ 58.80