XML 74 R63.htm IDEA: XBRL DOCUMENT v3.10.0.1
Earnings Per Share - Additional Information (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Potentially dilutive shares 0 100,000 0 100,000
Shares from treasury stock utilized by the Stock Incentive Plan 9,000 30,000 200,000 100,000