Summary of Significant Accounting Policies - Reclassification of Inventory (Details) (Change in Accounting Method Accounted for as Change in Estimate [Member], USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	Jan. 02, 2011	Dec. 31, 2012	Dec. 31, 2011
Change in Accounting Method Accounted for as Change in Estimate [Member]
Change in Accounting Estimate [Line Items]
Reclassification adjustment for certain inventory	$ 10.3
Term of inventory amortization		3 years	3 years