Accounts Payable and Accrued Expenses - Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Payables And Accruals [Abstract]
Accounts payable	$ 49,700	$ 11,500
Accrued payroll and compensated absences	7,400	4,500
Accrued bonuses	4,000	4,300
Professional fees	1,300	300
Deferred revenue	3,100	2,400
Accrued national representation fees	1,600	1,000
Income taxes payable	3,400	8,500
Other taxes payable	10,400	2,100
Amounts due under joint sales agreements	1,200	1,300
Accrued property taxes	1,800	1,500
Accrued capital expenditures	1,200	700
Accrued media costs – digital	36,200	9,900
Other	5,500	5,900
Accounts Payable and Accrued Expenses	$ 126,849	$ 53,931