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Benefit Plans (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
payment
Mar. 31, 2018
USD ($)
Mar. 15, 2019
employee
Defined Benefit Plan Disclosure [Line Items]      
Percentage of first employee compensation for which company makes matching contribution 1.00%    
Company contribution on employee specific contribution 50.00%    
Number of hours in service required for the contribution to be allocated 1000 hours    
Minimum eligibility for employees under 401(k) Plan age 19 years    
Number of plan service years after which employer matching contribution best 2 years    
Expense attributable to the Plan amounted $ 247 $ 233  
Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of employee for which company makes specified contribution 2.00%    
Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of employee for which company makes specified contribution 6.00%    
Supplemental Executive Retirement Plans and Participation Agreements      
Defined Benefit Plan Disclosure [Line Items]      
Expense attributable to the Plan amounted $ 23    
Number of employees | employee     3
Number of monthly installments for retirement benefits payable | payment 180