Long-Term Debt (Details) (USD $)	9 Months Ended
	Sep. 24, 2014	Dec. 25, 2013
Line of Credit Facility [Line Items]
Weighted-average interest rate (in hundredths)	2.16%	2.17%
Maturity date	Apr. 24, 2018
Secured Debt [Member]
Line of Credit Facility [Line Items]
Term loan, original principal amount	$ 60,000,000
Outstanding amount under credit facility	55,500,000
Basis spread on variable rate debt	2.00%
Debt Instrument, periodic amortization, principal, years one and two	5.00%
Debt Instrument, periodic amortization, principal, years three and four	7.50%
Debt Instrument, periodic amortization, principal, year five	10.00%
Repayments of term loan under the credit facility	2,300,000
Senior secured revolver [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity	190,000,000
Outstanding amount under credit facility	97,000,000
Availability under the revolving facility	67,300,000
Accordion feature that allows increase in size of facility	240,000,000
Commitment fee for unused portion of revolving credit facility (in hundredths)	0.35%
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity	30,000,000
Outstanding amount of letters of credit	25,700,000
Interest Rate Cap [Member] | Interest Rate Cap 2013-2014 [Member]
Line of Credit Facility [Line Items]
Interest rate cap, basis spread on variable rate (percent)	2.00%
Derivative, notional amount	125,000,000
Interest Rate Cap [Member] | Interest Rate Cap 2014-2015 [Member]
Line of Credit Facility [Line Items]
Interest rate cap, basis spread on variable rate (percent)	2.00%
Derivative, notional amount	150,000,000
Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Fair value of interest rate swaps	1,854,000
Interest Rate Swap [Member] | Interest Rate Swaps 2015-2017 [Member]
Line of Credit Facility [Line Items]
Derivative, notional amount	150,000,000
Average fixed interest rate on interest rate swaps	3.12%
Interest Rate Swap [Member] | Interest Rate Swaps 2017-2018 [Member]
Line of Credit Facility [Line Items]
Derivative, notional amount	$ 140,000,000
Average fixed interest rate on interest rate swaps	3.12%