Property and Equipment - Leased Property Held under Capital Leases and Included in Property and Equipment (Detail) - Machinery and Equipment [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Capital Leased Assets [Line Items]
Leased property	$ 2,093	$ 3,104
Less: accumulated depreciation	(737)	(1,229)
Leased property, net	$ 1,356	$ 1,875