Income Taxes - Federal Tax purpose (Details) - USD ($) $ in Thousands		6 Months Ended		12 Months Ended
	Oct. 06, 2016	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Effective tax rate (as a percent)		10.10%	14.20%
Valuation allowance on deferred tax assets		$ 14,800
Current portion of liabilities under tax receivable agreement		12,330		$ 8,089
Increase (decrease) in valuation allowance		$ 4,100
Common Class A
Shares issued		47,264,560		43,083,008
Class A common stock issued in exchange for common units in CWGS, LLC		4,000,000.0
Tax receivable agreement | CWGS, LLC
Units issued in exchange		4,181,552	110,000
Tax receivable agreement | Continuing Equity Owners and Crestview partners II GP LP
Payment, as percent of tax benefits (as a percent)	85.00%
Tax receivable agreement | Crestview Partners II GP LP
Liability under tax receivable agreement		$ 179,900		$ 145,900
Current portion of liabilities under tax receivable agreement		12,300		$ 8,100
Increase in tax receivable agreement liability		38,500
Increase Decrease In Deferred Tax Asset Due To Tax Receivable Agreement.		45,300
COVID-19
Deferral of non-income-based payroll taxes		29,200
COVID-19 | other long-term liabilities
Deferral of non-income-based payroll taxes		$ 14,600
Federal
Effective tax rate (as a percent)		21.00%
CWH | CWGS, LLC
Ownership interest		51.60%		47.40%
Crestview Partners II GP LP | Common Class A
Class A common stock issued in exchange for common units in CWGS, LLC		4,000,000.0
Crestview Partners II GP LP | CWGS, LLC
Common units redeemed		4,000,000.0
Number of units redeemed		4,000,000.0