Goodwill and other intangible assets (Details 1) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 29, 2014
Changes in the Company's net goodwill
Goodwill before accumulated impairment losses beginning balance	$ 11,106,277
Accumulated impairment losses beginning balance	(7,315,805)
Ending balance	3,790,472
Acquisitions and adjustments	21,381
Goodwill, Impairment Loss	(15,310)
Foreign currency exchange rate changes	8,008
Total	14,079
Goodwill before accumulated impairment losses beginning balance	11,214,714
Accumulated impairment losses ending balance	(7,410,163)
Ending balance	3,804,551
Broadcasting [Member]
Changes in the Company's net goodwill
Goodwill before accumulated impairment losses beginning balance	2,543,333
Accumulated impairment losses beginning balance	0
Ending balance	2,543,333
Acquisitions and adjustments	(16,430)
Goodwill, Impairment Loss	0
Foreign currency exchange rate changes	0
Total	(16,430)
Goodwill before accumulated impairment losses beginning balance	2,526,903
Accumulated impairment losses ending balance	0
Ending balance	2,526,903
Publishing [Member]
Changes in the Company's net goodwill
Goodwill before accumulated impairment losses beginning balance	7,807,416
Accumulated impairment losses beginning balance	(7,187,535)
Ending balance	619,881
Acquisitions and adjustments	4,578
Goodwill, Impairment Loss	(15,310)
Foreign currency exchange rate changes	6,666
Total	(4,066)
Goodwill before accumulated impairment losses beginning balance	7,897,708
Accumulated impairment losses ending balance	(7,281,893)
Ending balance	615,815
Digital [Member]
Changes in the Company's net goodwill
Goodwill before accumulated impairment losses beginning balance	755,528
Accumulated impairment losses beginning balance	(128,270)
Ending balance	627,258
Acquisitions and adjustments	33,233
Goodwill, Impairment Loss	0
Foreign currency exchange rate changes	1,342
Total	34,575
Goodwill before accumulated impairment losses beginning balance	790,103
Accumulated impairment losses ending balance	(128,270)
Ending balance	$ 661,833