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Earnings Per Share (Details 1) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Schedule of Earnings Per Share, Basic and Diluted, Including Two Class Method [Line Items]        
Net income attributable to Graham Holdings Company common stockholders $ 57,081 $ 46,566 $ 138,829 $ 89,457
Less: Dividends paid-common stock outstanding and unvested restricted shares (7,388) (6,948) (22,167) (21,587)
Undistributed earnings $ 49,693 $ 39,618 $ 116,662 $ 67,870
Percent allocated to common stockholders 99.43% 99.33% 99.43% 99.33%
Undistributed Earnings Allocated To Common Stockholders $ 49,410 $ 39,352 $ 115,997 $ 67,416
Add: Dividends paid-common stock outstanding 7,346 6,901 22,041 21,444
Numerator for basic earnings per share 56,756 46,253 138,038 88,860
Add: Additional undistributed earnings due to dilutive stock options 2 2 5 3
Numerator for diluted earnings per share $ 56,758 $ 46,255 $ 138,043 $ 88,863
Weighted average shares outstanding (shares) 5,285 5,325 5,285 5,380
Denominator for diluted earnings per share (shares) 5,329 5,362 5,328 5,417
Graham Holdings Company Common Stockholders:        
Basic income per common share in dollars per share $ 10.74 $ 8.69 $ 26.12 $ 16.52
Diluted income per common share in dollars per share $ 10.65 $ 8.63 $ 25.91 $ 16.40
Stock Option Plan [Member]        
Schedule of Earnings Per Share, Basic and Diluted, Including Two Class Method [Line Items]        
Add: Effect of dilutive stock options (shares) 44 37 43 37