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Acquisitions and Dispositions - Unaudited Pro Forma Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Combinations [Abstract]    
Net revenue $ 2,484,214 $ 2,457,492
Income before income taxes 288,279 124,966
Net income 503,871 49,318
Net income attributable to Nexstar $ 503,541 $ 46,547
Net income per common share attributable to Nexstar - basic $ 10.84 $ 0.99
Net income per common share attributable to Nexstar - diluted $ 10.52 $ 0.97