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Other Indefinite-Lived Intangible Assets - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill And Other Intangible Assets [Line Items]    
Impairment of intangible assets, indefinite-lived (excluding goodwill) $ 2,870,000 $ 19,000
Goodwill and Mastheads [Member]    
Goodwill And Other Intangible Assets [Line Items]    
Impairment of intangible assets, indefinite-lived (excluding goodwill) $ 36,000