Basis of Presentation and Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Oct. 01, 2010	Sep. 30, 2011	Oct. 01, 2010
Total revenue as reported and pro forma total revenue
Net revenue, Total	$ 138,871	$ 104,784	$ 405,702	$ 285,149
Basis of Presentation (Textual) [Abstract]
Percentage of revenue recognized upon completion of all services under completed contract method			100.00%
As Reported
Total revenue as reported and pro forma total revenue
Net revenue, Total	138,871		405,702
Pro Forma
Total revenue as reported and pro forma total revenue
Net revenue, Total	$ 132,026		$ 393,565