Contingent Consideration Net Revenue Performance Targets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Baseline | Fiscal 2013
Business Acquisition [Line Items]
Net revenue performance targets	$ 3,500
Baseline | Fiscal 2014
Business Acquisition [Line Items]
Net revenue performance targets	5,500
Baseline | Fiscal 2015
Business Acquisition [Line Items]
Net revenue performance targets	8,500
Upside | Fiscal 2013
Business Acquisition [Line Items]
Net revenue performance targets	5,000
Upside | Fiscal 2014
Business Acquisition [Line Items]
Net revenue performance targets	10,000
Upside | Fiscal 2015
Business Acquisition [Line Items]
Net revenue performance targets	$ 15,000