Accounts Payable and Accrued Expenses - Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Payables And Accruals [Abstract]
Accounts payable	$ 14,700	$ 23,700
Accrued payroll and compensated absences	5,200	6,700
Accrued bonuses	6,300	5,600
Professional fees	500	300
Deferred revenue	2,800	3,000
Accrued national representation fees	1,000	800
Income taxes payable	300	400
Other taxes payable	3,300	3,100
Amounts due under joint sales agreements	1,200	1,000
Accrued property taxes	1,500	1,300
Accrued capital expenditures	700	1,700
Accrued media costs – digital	6,000	6,100
Other	7,500	8,100
Accounts Payable and Accrued Expenses	$ 51,034	$ 61,847