Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified			1 Months Ended		1 Months Ended				12 Months Ended
	Dec. 27, 2012	Dec. 27, 2012 Amendment To Senior Credit Facility	Dec. 27, 2012 Term Loans	Dec. 31, 2012 Term Loans	Dec. 27, 2012 Revolving Credit Facilities	Dec. 31, 2012 Revolving Credit Facilities	Dec. 31, 2012 Senior Secured Credit Facility Prime Rate Plus	Dec. 31, 2012 Senior Secured Credit Facility Libor Rate Plus	Dec. 31, 2012 Senior Credit Facility Revolver Minimum	Dec. 31, 2012 Senior Credit Facility Revolver Maximum	Dec. 31, 2012 Amended and Restated Credit Agreement	Dec. 31, 2012 Amended and Restated Credit Agreement Restricted Payments	Dec. 31, 2012 Amended and Restated Credit Agreement Senior Secured Credit Facility Minimum
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 125.0	$ 50.0		$ 75.0
Debt instrument maturity period			5 years		5 years
Revolving credit facility maturity year	2017-12
Available for borrowings capacity						75.0
Debt instrument interest rate				4.50%
Variable interest rate							1.25%	2.25%
Unused Commitment Fees Percentage									0.25%	0.625%
Maximum consolidated leverage ratio											2.75	2.25
Remaining borrowing capacity													$ 25.0
Fixed charge coverage ratio, maximum											1.50