Property and Equipment - Components of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Gross Property and Equipment	$ 268,065	$ 243,829
Less accumulated depreciation and amortization	(166,716)	(146,007)
Net property and equipment	101,349	97,822
Buildings [Member]
Property, Plant and Equipment [Line Items]
Gross Property and Equipment	2,134	2,086
Land [Member]
Property, Plant and Equipment [Line Items]
Gross Property and Equipment	504	504
Machinery, Equipment and Tooling [Member]
Property, Plant and Equipment [Line Items]
Gross Property and Equipment	88,222	81,464
Furniture and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross Property and Equipment	12,672	12,003
Computers and Software [Member]
Property, Plant and Equipment [Line Items]
Gross Property and Equipment	130,357	111,793
Automobiles [Member]
Property, Plant and Equipment [Line Items]
Gross Property and Equipment	18	18
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross Property and Equipment	16,380	15,494
Projects In Progress - Computers and Software [Member]
Property, Plant and Equipment [Line Items]
Gross Property and Equipment	2,217	9,135
Projects in Progress - Other [Member]
Property, Plant and Equipment [Line Items]
Gross Property and Equipment	$ 15,561	$ 11,332