Quarterly report pursuant to Section 13 or 15(d)

Goodwill - Schedule of Changes in Goodwill (Detail)

v3.19.2
Goodwill - Schedule of Changes in Goodwill (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Goodwill [Line Items]    
Balance before cumulative loss on impairment, beginning of period $ 28,818 $ 28,453
Accumulated loss on impairment, beginning of period (2,029) (2,029)
Balance after cumulative loss on impairment, beginning of period 26,789 26,424
Balance before cumulative loss on impairment, end of period 28,474 28,818
Accumulated loss on impairment, end of period (2,029) (2,029)
Balance after cumulative loss on impairment, end of period 26,445 26,789
Radio Stations [Member]    
Goodwill [Line Items]    
Acquisitions   7
Goodwill, Written off Related to Sale of Business Unit (3) (628)
Digital Media [Member]    
Goodwill [Line Items]    
Acquisitions   $ 986
Goodwill, Written off Related to Sale of Business Unit $ (341)