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Plan's Benefit Obligations, Fair Value of Plan Assets, and Funded Status (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Compensation And Retirement Disclosure [Abstract]    
Benefit Obligation $ 263 $ 201
Fair value of plan assets 325 310
Defined Benefit Plan, Funded Status of Plan (62) (109)
Noncurrent liabilities (assets) (62) (109)
Net amount recognized (62) (109)
Amounts recognized in accumulated comprehensive income consist of:    
Unrecognized net gain (loss) $ (58) $ 0