Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended						3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended
	Jun. 29, 2012 Senior Credit Facility Term Loan	Jun. 29, 2012 Senior Credit Facility Term Loan Minimum	Jun. 29, 2012 Senior Credit Facility Term Loan Maximum	Jun. 29, 2012 Senior Credit Facility Revolver	Jun. 29, 2012 Senior Credit Facility Revolving Loans	Jun. 29, 2012 Term Loan	Jun. 29, 2012 Senior Credit Facility	Jun. 29, 2012 Senior Credit Facility	Dec. 31, 2011 Senior Credit Facility	Jul. 01, 2011 12.25% Senior Secured Notes Due Twenty Fourteen	Jul. 01, 2011 12.25% Senior Secured Notes Due Twenty Fourteen
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 40.0			$ 40.0
Quarterly installments payable on term loan	2.5
Debt instrument maturity period	4 years			4 years
Revolving credit facility maturity year				2015
Additional uncommitted incremental facility					25.0
Commitment fee on unused commitments		0.30%	0.50%
Interest rates				2.85%		2.97%
Interest expense							0.4	1.0		3.4	7.1
Non-cash amortization of deferred financing costs							0.3	0.5
Line of outstanding credit							$ 53.0	$ 53.0	$ 68.0