Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2012	Feb. 22, 2013 Class A Common Stock [Member]	Feb. 22, 2013 Class B Common Stock [Member]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Trading Symbol	wpo
Entity Registrant Name	WASHINGTON POST CO
Entity Central Index Key	0000104889
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Public Float	$ 2,300,000,000.00
Entity Common Stock, Shares Outstanding		1,219,383	6,204,349