Earnings Per Share - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share Basic And Diluted [Line Items]
Potentially dilutive shares	6,000	2,000	6,000	2,000
Shares from treasury stock utilized by the Stock Incentive Plan	100,000	200,000	29,000	200,000