Investments in Unconsolidated Companies and Miami Land and Building (Details) (USD $) In Thousands, unless otherwise specified	Jun. 24, 2012	Dec. 25, 2011
Investments in unconsolidated companies and joint ventures
Investments in unconsolidated companies	$ 320,153	$ 304,893
Career Builder LLC [Member]
Investments in unconsolidated companies and joint ventures
Investments in unconsolidated companies	222,501	218,805
Portfolios of premium digital assets	15.00%
Classified Ventures LLC [Member]
Investments in unconsolidated companies and joint ventures
Investments in unconsolidated companies	76,718	66,886
Portfolios of premium digital assets	25.60%
Home Finder LLC [Member]
Investments in unconsolidated companies and joint ventures
Investments in unconsolidated companies	3,135	1,628
Portfolios of premium digital assets	33.30%
Seattle Times Company (C-Corporation) [Member]
Investments in unconsolidated companies and joint ventures
Investments in unconsolidated companies
Portfolios of premium digital assets	49.50%
Ponderay (general partnership) [Member]
Investments in unconsolidated companies and joint ventures
Investments in unconsolidated companies	12,064	11,800
Portfolios of premium digital assets	27.00%
Other [Member]
Investments in unconsolidated companies and joint ventures
Investments in unconsolidated companies	$ 5,735	$ 5,774