Subsequent Events - Additional Information (Detail) - USD ($) $ in Thousands	Jan. 16, 2018	Jan. 31, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Restricted cash			$ 222,294
Subsequent Event
Subsequent Event [Line Items]
Restricted cash		$ 221,500
Subsequent Event | KMCC-TV
Subsequent Event [Line Items]
Business acquisition date	Jan. 16, 2018
Payment to acquire television station	$ 3,600
Business acquisition description of acquired entity	the Company completed the acquisition of television station KMCC-TV, which serves the Las Vegas, Nevada area