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Earnings Per Share ("EPS") - Schedule of Reconciliation of Weighted Average Shares Used in Diluted EPS (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Line Items]        
Weighted average common shares-basic 18,834,886 18,413,756 18,790,612 18,409,331
Effect of dilutive securities        
Weighted average common shares-diluted 18,834,886 18,835,560 19,179,057 18,811,356
Stock Options And Stock Purchase Plan [Member]        
Effect of dilutive securities        
Effect of diluted securities   327,171 259,967 318,047
Restricted Stock Units [Member]        
Effect of dilutive securities        
Effect of diluted securities   94,633 128,478 83,978