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Restructuring (Severance Accruals Incurred) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Restructuring [Abstract]    
Beginning accrued balance $ 346 $ 0
Charges incurred during the period   1,343
Payments during the period (346) (997)
Ending accrued balance $ 0 $ 346