Inventories (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Inventory, Net [Abstract]
Raw materials	$ 21,605	$ 11,944
Work in process	16,693	14,546
Finished goods	18,014	9,537
Inventory, Gross, Total	56,312	36,027
Less: Progress billings	(1,454)	(1,110)
Total inventories	$ 54,858	$ 34,917