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Acquisitions and Dispositions of Businesses (Narrative) (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 27, 2017
Apr. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jan. 31, 2015
school
Jun. 30, 2015
USD ($)
business
Sep. 30, 2014
school
Dec. 31, 2017
USD ($)
business
Dec. 31, 2016
USD ($)
business
Dec. 31, 2015
USD ($)
business
Jun. 29, 2017
Feb. 28, 2017
Sep. 30, 2016
Feb. 29, 2016
Jan. 31, 2016
Dec. 22, 2015
Nov. 13, 2015
business
Sep. 03, 2015
campus
Business Acquisition [Line Items]                                  
Cost of acquisition             $ 318,900,000 $ 258,000,000 $ 163,300,000                
Pension and other post retirement benefits liabilities             $ 59,100,000                    
Number of businesses acquired | business             6 5 2                
Payments to Acquire Businesses, Net of Cash Acquired             $ 299,938,000 $ 245,084,000 $ 159,320,000                
Acquisition-related costs             4,100,000 1,500,000                  
Goodwill expected to be deductible for income tax purposes             11,000,000 22,200,000 20,000,000                
Measurement period adjustment               (20,024,000)                  
Revenues of acquired companies since acquisition date             199,400,000                    
Operating income of acquired companies since acquisition date             4,500,000                    
Change in redemption value of redeemable noncontrolling interests             (446,000) (3,026,000) (2,601,000)                
Treasury stock increase             $ 50,770,000 $ 108,948,000 22,979,000                
Group Dekko [Member]                                  
Business Acquisition [Line Items]                                  
Percentage of interest acquired                               100.00%  
Number of business lines | business                               3  
Education [Member]                                  
Business Acquisition [Line Items]                                  
Number of businesses acquired | business             2 3                  
Measurement period adjustment               $ (2,781,000)                  
Number Of Businesses Disposed | business         2                        
Education [Member] | Genesis [Member]                                  
Business Acquisition [Line Items]                                  
Percentage of interest acquired                     100.00%            
Education [Member] | Red Marker [Member]                                  
Business Acquisition [Line Items]                                  
Percentage of interest acquired                     100.00%            
Education [Member] | SmartPros [Member]                                  
Business Acquisition [Line Items]                                  
Percentage of interest acquired                             100.00%    
Television Broadcasting [Member]                                  
Business Acquisition [Line Items]                                  
Number of businesses acquired | business             2                    
Measurement period adjustment               $ 0                  
Other Businesses [Member]                                  
Business Acquisition [Line Items]                                  
Number of businesses acquired | business             2 2                  
Measurement period adjustment               $ (17,243,000)                  
Other Businesses [Member] | Hoover Treated Wood Products [Member]                                  
Business Acquisition [Line Items]                                  
Percentage of interest acquired   97.72%                              
Payments to Acquire Businesses, Net of Cash Acquired   $ 206,800,000                              
Fair value of redeemable noncontrolling interest acquired   $ 3,700,000.0                              
Graham Healthcare Group [Member] | Hometown Home Health and Hospice [Member]                                  
Business Acquisition [Line Items]                                  
Percentage of interest acquired                   100.00%              
Residential Healthcare Group Inc [Member]                                  
Business Acquisition [Line Items]                                  
Noncontrolling interest purchased     20.00%                            
Change in redemption value of redeemable noncontrolling interests     $ 3,000,000                            
Redeemable Noncontrolling Interest, Equity, Common, Redemption Value     $ 24,000,000                            
Celtic Healthcare Inc [Member]                                  
Business Acquisition [Line Items]                                  
Noncontrolling interest exchanged     20.00%                            
Celtic Healthcare Inc [Member] | Celtic Healthcare Allegheny Health Network Joint Venture [Member]                                  
Business Acquisition [Line Items]                                  
Ownership percentage of investment in affiliate       40.00%                          
Graham Healthcare Group [Member]                                  
Business Acquisition [Line Items]                                  
Change in redemption value of redeemable noncontrolling interests     $ 4,100,000                            
Noncontrolling Interest, Ownership Percentage by Parent             90.00%                    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     10.00%                            
Graham Healthcare Group [Member] | Residential Hospice Illinois [Member]                                  
Business Acquisition [Line Items]                                  
Ownership percentage of investment in affiliate             42.50%                    
Graham Healthcare Group [Member] | Residential Home Health Illinois [Member]                                  
Business Acquisition [Line Items]                                  
Ownership percentage of investment in affiliate             40.00%                    
Graham Healthcare Group [Member] | Celtic Healthcare Allegheny Health Network Joint Venture [Member]                                  
Business Acquisition [Line Items]                                  
Ownership percentage of investment in affiliate             40.00%                    
Group Dekko [Member] | Electri-Cable Assemblies [Member]                                  
Business Acquisition [Line Items]                                  
Percentage of interest acquired                       100.00%          
Kaplan University Transaction [Member] | Education [Member]                                  
Business Acquisition [Line Items]                                  
Transition and Operations Support Agreement Initial Term 30 years                                
Transition and Operations Support Agreement Buy-Out Option Eligible Year 6 years                                
Residential And Michigan Hospital Joint Venture [Member] | Residential Healthcare Group Inc [Member]                                  
Business Acquisition [Line Items]                                  
Ownership percentage of investment in affiliate     40.00%                            
Percentage of joint venture sold     60.00%                            
Kaplan International [Member] | Education [Member]                                  
Business Acquisition [Line Items]                                  
Measurement period adjustment               0                  
Kaplan International [Member] | Education [Member] | Mander Portman Woodward [Member]                                  
Business Acquisition [Line Items]                                  
Percentage of interest acquired                           100.00%      
Kaplan International [Member] | Education [Member] | Osborne Books [Member]                                  
Business Acquisition [Line Items]                                  
Percentage of interest acquired                         100.00%        
Kaplan International [Member] | Kaplan China [Member] | Education [Member]                                  
Business Acquisition [Line Items]                                  
Number of schools sold | school       1   3                      
Higher Education [Member] | Education [Member]                                  
Business Acquisition [Line Items]                                  
Measurement period adjustment               $ (2,781,000)                  
Higher Education [Member] | KHE Campuses [Member] | Education [Member]                                  
Business Acquisition [Line Items]                                  
Disposal Group, Not Discontinued Operation, Revenue                 $ 167,093,000                
Number of nationally accredited ground campuses sold | campus                                 38
Impairment Of Long Lived Assets         $ 6,900,000