Inventories (Detail) - USD ($) $ in Thousands	Jul. 04, 2015	Dec. 31, 2014	Jun. 28, 2014
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 73,309	$ 77,033
Work in process	58,992	61,458
Finished goods	10,568	14,116
Inventory, Gross, Total	142,869	152,607
Less progress payments	4,855	9,765
Total	$ 138,014	$ 142,842	$ 142,201