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Employee Benefit Plans - Recognized Net Periodic Benefit Cost and Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Retirement Benefits [Abstract]      
Service cost $ 87 $ 103 $ 103
Interest cost 83 114 108
Net amortization of transition obligation and actuarial loss 84 192 184
Net periodic benefit cost 254 409 395
Net (gain) loss (404) (808) 282
Amortization of loss (84) (192) (184)
Total recognized in other comprehensive income (488) (1,000) 98
Total recognized in net periodic benefit cost and other comprehensive income $ (234) $ (591) $ 493