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Weighted Average Common Shares - Additional Information (Detail) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Anti-dilutive awards excluded from computations of diluted earnings per share 0 0 0 0