Annual report pursuant to Section 13 and 15(d)

Estimated Useful Lives of Assets (Detail)

v3.20.4
Estimated Useful Lives of Assets (Detail)
 12 Months Ended
Dec. 31, 2020
Buildings On Owned Land  
Property, Plant and Equipment [Line Items]  
Estimated useful life of assets 40 years
Buildings On Leased Land  
Property, Plant and Equipment [Line Items]  
Estimated useful life of assets Lesser of lease term or useful life
Land And Buildings Under Finance Leases  
Property, Plant and Equipment [Line Items]  
Estimated useful life of assets Lesser of lease term or useful life
Theatre furniture and equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful life of assets 3 years
Theatre furniture and equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful life of assets 15 years
Leasehold Improvements  
Property, Plant and Equipment [Line Items]  
Estimated useful life of assets Lesser of lease term or useful life