Debt - Fair Value of Debt (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Notes Payable to Banks [Member] | Term Loans [Member] | Carrying Amount [Member] | Level 3 [Member]
Fair Value of debt [Line Items]
Carrying Amount and Fair Value of Debt	[1]	$ 2,791,875	$ 662,206
Notes Payable to Banks [Member] | Term Loans [Member] | Fair Value [Member] | Level 3 [Member]
Fair Value of debt [Line Items]
Carrying Amount and Fair Value of Debt	[1]	2,852,199	665,750
Revolving loans [Member] | Carrying Amount [Member] | Level 3 [Member]
Fair Value of debt [Line Items]
Carrying Amount and Fair Value of Debt	[1]	3,000	2,000
Revolving loans [Member] | Fair Value [Member] | Level 3 [Member]
Fair Value of debt [Line Items]
Carrying Amount and Fair Value of Debt	[1]	2,985	1,969
Senior Subordinated Notes [Member] | 6.875 % Due 2020 [Member] | Carrying Amount [Member] | Level 2 [Member]
Fair Value of debt [Line Items]
Carrying Amount and Fair Value of Debt	[2]		520,705
Senior Subordinated Notes [Member] | 6.875 % Due 2020 [Member] | Fair Value [Member] | Level 2 [Member]
Fair Value of debt [Line Items]
Carrying Amount and Fair Value of Debt	[2]		543,375
Senior Subordinated Notes [Member] | 6.125% Due 2022 [Member] | Carrying Amount [Member] | Level 2 [Member]
Fair Value of debt [Line Items]
Carrying Amount and Fair Value of Debt	[2]	273,008	272,598
Senior Subordinated Notes [Member] | 6.125% Due 2022 [Member] | Fair Value [Member] | Level 2 [Member]
Fair Value of debt [Line Items]
Carrying Amount and Fair Value of Debt	[2]	284,625	284,625
Senior Subordinated Notes [Member] | 5.875% Senior Notes Due 2022 [Member] | Carrying Amount [Member] | Level 2 [Member]
Fair Value of debt [Line Items]
Carrying Amount and Fair Value of Debt	[2]	408,102
Senior Subordinated Notes [Member] | 5.875% Senior Notes Due 2022 [Member] | Fair Value [Member] | Level 2 [Member]
Fair Value of debt [Line Items]
Carrying Amount and Fair Value of Debt	[2]	415,500
Senior Subordinated Notes [Member] | 5.625 % Due 2024 [Member] | Carrying Amount [Member] | Level 2 [Member]
Fair Value of debt [Line Items]
Carrying Amount and Fair Value of Debt	[2]	886,475	884,512
Senior Subordinated Notes [Member] | 5.625 % Due 2024 [Member] | Fair Value [Member] | Level 2 [Member]
Fair Value of debt [Line Items]
Carrying Amount and Fair Value of Debt	[2]	$ 925,875	$ 893,250

[1] The fair value of senior secured credit facilities is computed based on borrowing rates currently available to the Company for bank loans with similar terms and average maturities. These fair value measurements are considered Level 3, as significant inputs to the fair value calculation are unobservable in the market.

[2] The fair value of Nexstar’s fixed rate debt is estimated based on bid prices obtained from an investment banking firm that regularly makes a market for these financial instruments. These fair value measurements are considered Level 2, as quoted market prices are available for low volume trading of these securities.