Income Taxes - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Federal statutory rate	35.00%
Net deferred tax liabilities	$ 36,965	$ 50,907
Deferred tax assets, operating loss carryforwards, state and local	10,700
Decrease in valuation allowance	3,500
Tax Cuts and Jobs Act, change in tax rate, income tax expense (benefit)	19,200
Tax Cuts and Jobs Act, change in tax rate, deferred tax asset, income tax expense	19,100
Tax Cuts And Jobs Act Of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional liability	300
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	136,800
Domestic Tax Authority | Townsquare Media, Inc.
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	50,400
Domestic Tax Authority | Townsquare Media Inc., Post LLC Conversion
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	86,400
CANADA
Operating Loss Carryforwards [Line Items]
Net deferred tax liabilities	$ 900