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Plan's Benefit Obligations, Fair Value of Plan Assets, and Funded Status (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]    
Benefit Obligation $ 320 $ 295
Fair value of plan assets 376 365
Defined Benefit Plan, Funded Status of Plan (56) (70)
Noncurrent liabilities (assets) (56) (70)
Net amount recognized (56) (70)
Amounts recognized in accumulated comprehensive income (loss) consist of:    
Unrecognized net gain (loss) $ (86) $ (69)