Summary of Significant Accounting Policies - Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Total cost	$ 167,799	$ 165,393
Accumulated depreciation and amortization	(51,459)	(45,543)
Property and equipment, net	116,340	119,850
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	30,428	30,364
Machinery, equipment and tooling [Member]
Property, Plant and Equipment [Line Items]
Total cost	106,857	103,477
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	941	941
Information systems [Member]
Property, Plant and Equipment [Line Items]
Total cost	1,070	1,070
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 16,674	$ 17,712