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Restructuring Expenses - Schedule of Restructuring and Related Costs (Detail) - Lease Liability [Member] - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Restructuring Cost And Reserve [Line Items]    
Restructuring reserve balance $ 820 $ 1,039
Charges 0 0
Payments/Utilizations (155) (219)
Restructuring reserve balance $ 665 $ 820