Leases - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) ft²	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Lessee Lease Description [Line Items]
Remaining term description of leases	The Company’s existing leases have remaining terms of less than one year up to 32 years.
Non-cancelable operating lease expiration term	2024-09
Weighted average remaining lease term	11 years 4 months 24 days
Weighted average discount rate	6.20%
Lease cost	$ 12,878
Total rent expense under operating leases		$ 12,000	$ 10,500
Direct Operating Expenses
Lessee Lease Description [Line Items]
Lease cost	6,100
Selling, General and Administrative Expenses
Lessee Lease Description [Line Items]
Lease cost	6,000
Corporate Expenses
Lessee Lease Description [Line Items]
Lease cost	$ 800
Santa Monica
Lessee Lease Description [Line Items]
Area under operating leases for corporate headquarters | ft²	16,000
Lease Expiration Year	2021
Los Angeles
Lessee Lease Description [Line Items]
Area under operating leases for corporate headquarters | ft²	41,000
Lease Expiration Year	2026
Facilities and Broadcast Equipment
Lessee Lease Description [Line Items]
Non-cancelable operating lease expiration term	2051-02
Maximum
Lessee Lease Description [Line Items]
Remaining term of leases	32 years