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Earnings Per Share Reconciliation - Additional Information (Detail) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Antidilutive securities excluded from computation of earnings per common share 14 11 13 8