Description of Business, Company History and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
May 31, 2017	Mar. 31, 2019
Description of business and basis of presentation [Line Items]
Percentage of ownership by the company		100.00%
Spinoff
Description of business and basis of presentation [Line Items]
Cash transfer made to parent company	$ 650.0
TEGNA Inc \| Spinoff
Description of business and basis of presentation [Line Items]
Date of separation	May 31, 2017

Date the exit and disposal activities were completed or are expected to be completed, in CCYY-MM-DD format.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(a))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration