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Acquisitions and Dispositions - WVMH - Additional Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 31, 2017
USD ($)
Aug. 02, 2016
Jan. 04, 2016
USD ($)
Nov. 16, 2015
USD ($)
TelevisionStation
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]                              
Revenue included in consolidated statements of operations and comprehensive income         $ 798,022 $ 693,015 $ 660,323 $ 615,336 $ 653,664 $ 611,870 $ 626,115 $ 540,317 $ 2,766,696 $ 2,431,966 $ 1,103,190
Operating income (loss)         $ 272,776 $ 192,893 $ 174,494 $ 117,616 $ 136,660 $ 125,916 $ 135,529 $ 107,520 $ 757,779 505,625 287,308
WVMH [Member]                              
Business Acquisition [Line Items]                              
Acquisition date       Nov. 16, 2015                      
Purchase price of entities to be acquired       $ 130,000                      
Cash paid in business acquisition $ 66,900   $ 64,964                        
Deposits and payments for acquisitions       $ 6,500                      
Revenue included in consolidated statements of operations and comprehensive income                           51,300  
Operating income (loss)                           11,500  
Acquisition related costs                           $ 0 $ 0
WVMH [Member] | Consolidated VIEs [Member]                              
Business Acquisition [Line Items]                              
Network affiliation agreements useful life   15 years                          
WVMH [Member] | Other definite-lived intangible assets [Member]                              
Business Acquisition [Line Items]                              
Weighted average estimated useful life of other intangible assets     3 years                        
WVMH [Member] | CBS Affiliation [Member]                              
Business Acquisition [Line Items]                              
Number of television stations to be acquired | TelevisionStation       3                      
WVMH [Member] | NBC Affiliation [Member]                              
Business Acquisition [Line Items]                              
Number of television stations to be acquired | TelevisionStation       1