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Earnings Per Share - 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
Stock Compensation Plans [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Options to purchase common stock, Shares 138 249 138 249