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(Loss) Earnings Per Share (Details 1) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Schedule of (Loss) Earnings Per Share, Basic and Diluted, Including Two Class Method [Line Items]    
Net (loss) income attributable to Graham Holdings Company common stockholders $ (33,245) $ 81,748
Less: Dividends paid-common stock outstanding and unvested restricted shares (15,289) (14,779)
Undistributed (loss) earnings $ (48,534) $ 66,969
Percent allocated to common stockholders 100.00% 99.43%
Undistributed (Loss) Earnings Allocated To Common Stockholders $ (48,534) $ 66,588
Add: Dividends paid-common stock outstanding 15,205 14,695
Numerator for basic earnings per share (33,329) 81,283
Add: Additional undistributed earnings due to dilutive stock options 0 3
Numerator for diluted (loss) earnings per share $ (33,329) $ 81,286
Weighted average shares outstanding (shares) 5,274 5,284
Denominator for diluted (loss) earnings per share (shares) 5,274 5,326
Graham Holdings Company Common Stockholders:    
Basic (loss) income per common share in dollars per share $ (6.32) $ 15.38
Diluted (loss) income per common share in dollars per share $ (6.32) $ 15.26
Stock Option Plan [Member]    
Schedule of (Loss) Earnings Per Share, Basic and Diluted, Including Two Class Method [Line Items]    
Add: Effect of dilutive stock options (shares) 0 42