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Income taxes - Schedule of Valuation Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets, Valuation Allowance [Roll Forward]
Beginning at beginning of period	$ 125,894	$ 136,418	$ 209,939
Additions to valuation allowance	9,545	3,908	40,180
Reductions to valuation allowance	(89,778)	(14,432)	(113,701)
Balance at the end of the period	$ 45,661	$ 125,894	$ 136,418

X

- Definition

Deferred Tax Asset, Valuation Allowance, Additions

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Deferred Tax Asset, Valuation Allowance, Reductions

+ References

No definition available.

+ Details

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Namespace Prefix:	tgna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Deferred Tax Assets, Valuation Allowance [Roll Forward]

+ References

No definition available.

+ Details

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Namespace Prefix:	tgna_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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