Accounts Payable and Accrued Expenses - Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Payables And Accruals [Abstract]
Accounts payable	$ 6,100	$ 6,600
Accrued payroll and compensated absences	6,300	6,400
Accrued bonuses	1,400	1,500
Professional fees	500	200
Deferred revenue	3,200	3,100
Accrued national representation fees	1,100	1,100
Income taxes payable	400	300
Amounts due under joint sales agreements	2,900	2,800
Accrued property taxes	1,600	1,200
Accrued capital expenditures	1,000	800
Accrued media costs – digital	1,200	900
Other	5,100	4,900
Accounts Payable and Accrued Expenses	$ 30,810	$ 29,787