Tellurian Inc. Annual report pursuant to Section 13 and 15(d)

Property, Plant and Equipment - Additional Information (Detail) $ in Millions	1 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($)	May 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 license	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items]
Depreciation and depletion expense					$ 1.5	$ 0.5	$ 0.1
Write-off of non-producing acreage	$ 2.7
Cash consideration from transfer of permit		$ 0.2
Decrease in liabilities from transfer of permit		$ 1.3
Loss on transfer of permit			$ 1.0
United Kingdom
Property, Plant and Equipment [Line Items]
Number of non-operating interest in licenses \| license				2