Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Schedule of Shares Used to Compute Basic and Diluted Net Earning Per Share (Detail)

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Summary of Significant Accounting Policies - Schedule of Shares Used to Compute Basic and Diluted Net Earning Per Share (Detail) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]    
Weighted average shares 26,179,702 26,068,942
Effect of dilutive securities-stock options   366,815
Weighted average shares adjusted for dilutive securities 26,179,702 26,435,757