Inventories (Summary of Inventories) (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 24,518	$ 17,128
Work in process	17,161	14,670
Finished goods	25,360	15,048
Inventory, Gross, Total	67,039	46,846
Less: Progress billings	(893)	(316)
Total inventories	$ 66,146	$ 46,530