Investments in Joint Ventures (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 25, 2011	Sep. 26, 2010	Sep. 25, 2011	Sep. 26, 2010
Equity method investments
Revenue	$ 389,814	$ 294,152	$ 963,626	$ 724,475
Cost and expenses	399,531	245,393	963,167	622,957
Operating (loss)/profit	(9,717)	48,759	459	101,518
Other income/(loss)	1,227	2,938	(8,094)	28,969
Pre-tax (loss)/income	(8,490)	51,697	(7,635)	130,487
Income tax expense/(benefit)	1,028	366	154	(642)
Net (loss)/income	(9,518)	51,331	(7,789)	131,129
Net income attributable to noncontrolling interest	6,279	6,973	16,974	18,512
Net (loss)/income less noncontrolling interest	$ (15,797)	$ 44,358	$ (24,763)	$ 112,617
Metro Boston LLC [Member]
Equity method investments
Equity Method Investment, Ownership Percentage	49.00%		49.00%
Donohue Malbaie Inc. [Member]
Equity method investments
Equity Method Investment, Ownership Percentage	49.00%		49.00%
Madison Paper Industries [Member]
Equity method investments
Equity Method Investment, Ownership Percentage	40.00%		40.00%
quadrantONE LLC [Member]
Equity method investments
Equity Method Investment, Ownership Percentage	25.00%		25.00%
Fenway Sports Group [Member]
Equity method investments
Equity Method Investment, Ownership Percentage	7.30%		7.30%

The amount of income tax expense (benefit) reported by an equity method investment of the entity.

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Net income or loss attributable to noncontrolling interest reported by an equity investment method investment of the entity.

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The amount of net income (loss) less noncontrolling interest reported by an equity method investment of the entity.

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The amount of other income (loss) reported by an equity method investment of the entity.

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The amount of pre tax income (loss) reported by an equity method investment of the entity.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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The amount of the cost of sales reported by an equity method investment of the entity.

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- Definition

The amount of gross profit (loss) reported by an equity method investment of the entity.

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The amount of net income (loss) reported by an equity method investment of the entity.

+ References

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The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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