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Business Segments (Narrative) (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2015
school
Dec. 31, 2016
USD ($)
TelevisionStation
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Sep. 30, 2014
school
Dec. 31, 2016
USD ($)
TelevisionStation
Segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
campus
Sep. 03, 2015
campus
Feb. 12, 2015
campus
Sep. 30, 2012
campus
Segment Reporting Information [Line Items]                                
Number of reportable segments | Segment                     4          
Operating Revenues   $ 629,579 $ 621,638 $ 628,933 $ 601,740 $ 616,367 $ 641,432 $ 680,890 $ 647,425   $ 2,481,890 $ 2,586,114 $ 2,737,032      
Television Broadcasting [Member]                                
Segment Reporting Information [Line Items]                                
Number of television broadcast stations owned | TelevisionStation   5                 5          
Education [Member]                                
Segment Reporting Information [Line Items]                                
Software asset write-offs                     $ 0 0 7,689      
Restructuring costs                     11,852 44,373 16,806      
Accrued restructuring costs   $ 11,800       24,200         11,800 24,200        
Non U.S. [Member]                                
Segment Reporting Information [Line Items]                                
Operating Revenues                     624,000 660,000 712,000      
Foreign assets   $ 67,000       $ 59,000         67,000 59,000        
UNITED KINGDOM                                
Segment Reporting Information [Line Items]                                
Operating Revenues                     312,000 319,000 351,000      
Higher Education [Member] | Education [Member]                                
Segment Reporting Information [Line Items]                                
Restructuring costs                     7,200 12,900 $ 6,500      
Number of campuses announced to close or consolidate | campus                         5     13
Other long-lived assets impairment charge               $ 6,900         $ 13,600      
Higher Education [Member] | Education [Member] | KHE Campuses [Member]                                
Segment Reporting Information [Line Items]                                
Number of nationally accredited ground campuses sold | campus                           38 38  
Kaplan International [Member] | Education [Member]                                
Segment Reporting Information [Line Items]                                
Restructuring costs                     $ 4,700 1,300 $ 200      
Kaplan International [Member] | Education [Member] | Kaplan China [Member]                                
Segment Reporting Information [Line Items]                                
Number of schools sold | school 1                 3            
Kaplan Corporate and Other [Member] | Education [Member]                                
Segment Reporting Information [Line Items]                                
Restructuring costs                       $ 29,400        
Related To Certain Items Recorded In 2011 And 2010 [Member] | Test Preparation [Member] | Education [Member]                                
Segment Reporting Information [Line Items]                                
Immaterial Error Correction Amount             $ 3,000