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Computation of Basic and Diluted EPS (Parenthetical) (Detail) - shares
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Options to purchase shares that were not included in the respective computation of diluted EPS because their inclusion would have had an antidilutive effect 0 0