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Earnings Per Share - Securities Not Included in Computation of Diluted Earnings Per Share (Detail) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share [Abstract]        
Options to purchase shares of common stock 989 650 989 215