Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 24, 2014		Dec. 25, 2013
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	$ 10,734		$ 11,211
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	8,880		8,168
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	1,854		3,043
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	0		0
Recurring [Member] | Deferred compensation plan investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan investments	8,880	[1]	8,168	[1]
Valuation technique	market approach		market approach
Recurring [Member] | Deferred compensation plan investments [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan investments	8,880	[1]	8,168	[1]
Recurring [Member] | Deferred compensation plan investments [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan investments	0	[1]	0	[1]
Recurring [Member] | Deferred compensation plan investments [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan investments	0	[1]	0	[1]
Recurring [Member] | Interest rate swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps and interest rate caps	1,854	[2]	3,032	[2]
Valuation technique	income approach		income approach
Recurring [Member] | Interest rate swaps [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps and interest rate caps	0	[2]	0	[2]
Recurring [Member] | Interest rate swaps [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps and interest rate caps	1,854	[2]	3,032	[2]
Recurring [Member] | Interest rate swaps [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps and interest rate caps	0	[2]	0	[2]
Recurring [Member] | Interest rate caps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps and interest rate caps	0	[2]	11	[2]
Valuation technique	income approach		income approach
Recurring [Member] | Interest rate caps [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps and interest rate caps	0	[2]	0	[2]
Recurring [Member] | Interest rate caps [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps and interest rate caps	0	[2]	11	[2]
Recurring [Member] | Interest rate caps [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps and interest rate caps	0	[2]	0	[2]
Nonrecurring [Member] | Assets held and used [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of long-lived assets held-for-use	320		4,795
Valuation technique	income approach		income approach
Nonrecurring [Member] | Assets held and used [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held and used	$ 0		$ 1,198

[1] The fair values of our deferred compensation plan investments are based on the closing market prices of the participants’ elected investments.

[2] The fair values of our interest rate swaps and interest rate caps are based upon Level 2 inputs, which include valuation models as reported by our counterparties. The key inputs for the valuation models are quoted market prices, interest rates and forward yield curves. See Note 7 for details on the interest rate swaps and interest rate caps.