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Income Tax - Accrued Interest and Penalties on Uncertain Tax Position (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Change In Tax Positions [Abstract]      
Accrued interest on uncertain tax position $ 800 $ 897 $ 2,355
Accrued penalties on uncertain tax position 486 535 1,060
Total accrued interest and penalties on uncertain tax position $ 1,286 $ 1,432 $ 3,415