Summary of Significant Accounting Policies - Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Total cost	$ 174,531	$ 172,658
Accumulated depreciation and amortization	(60,894)	(57,438)
Property and equipment, net	113,637	115,220
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	4,133	4,133
Buildings [Member]
Property, Plant and Equipment [Line Items]
Total cost	32,323	32,269
Machinery, equipment and tooling [Member]
Property, Plant and Equipment [Line Items]
Total cost	122,348	121,313
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	7,696	7,696
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Total cost	949	949
Information systems [Member]
Property, Plant and Equipment [Line Items]
Total cost	1,089	1,077
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 5,993	$ 5,221