Quarterly report pursuant to Section 13 or 15(d)

Summary of Impairment Charges (Detail)

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Summary of Impairment Charges (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Impaired Long-Lived Assets Held and Used [Line Items]        
Total Impairment $ 7,480,000 $ 24,595,000 $ 7,480,000 $ 41,214,000
U.S. Operating Segment        
Impaired Long-Lived Assets Held and Used [Line Items]        
Theatre properties 4,801,000 2,075,000 4,801,000 5,718,000
Theatre operating lease right-of-use assets 2,638,000 1,123,000 2,638,000 7,075,000
Cost method investment   2,500,000   2,500,000
Total Impairment 7,439,000 5,698,000 7,439,000 15,293,000
International Operating Segment        
Impaired Long-Lived Assets Held and Used [Line Items]        
Theatre properties 39,000 938,000 39,000 5,422,000
Theatre operating lease right-of-use assets 2,000 1,654,000 2,000 4,194,000
Goodwill   16,128,000   16,128,000
Intangible assets   177,000   177,000
Total Impairment $ 41,000 $ 18,897,000 $ 41,000 $ 25,921,000