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Earnings and Dividends per Share - Additional Information (Detail) - $ / shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
May 06, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings And Dividends Per Share [Abstract]            
Shares not included in computation of diluted Earning per share     1.5 1.2 1.6 1.2
Common Stock, dividends, per share, declared   $ 0.066        
Common Stock, dividends, per share, Paid $ 0.066