Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 61,840	$ 77,033
Work in process	49,299	61,458
Finished goods	10,073	14,116
Inventory, Gross, Total	121,212	152,607
Less progress payments	5,808	9,765
Total	$ 115,404	$ 142,842