Quarterly report pursuant to Section 13 or 15(d)

Summary of Activity for Each of Company's Other Investments (Detail)

v3.21.2
Summary of Activity for Each of Company's Other Investments (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Schedule Of Equity Method Investments [Line Items]        
Investments, beginning balance     $ 23,726  
Equity in loss of affiliates $ (7,146) $ (16,077) (22,061) $ (27,711)
Investments, ending balance 23,755   23,755  
Other Affiliates        
Schedule Of Equity Method Investments [Line Items]        
Investments, beginning balance     23,726  
Equity in loss of affiliates     (15)  
Other     44  
Investments, ending balance 23,755   23,755  
Other Affiliates | AC JV, LLC        
Schedule Of Equity Method Investments [Line Items]        
Investments, beginning balance     3,745  
Equity in loss of affiliates     (1,099)  
Investments, ending balance 2,646   2,646  
Other Affiliates | Digital Cinema Distribution Coalition        
Schedule Of Equity Method Investments [Line Items]        
Investments, beginning balance     1,255  
Equity in loss of affiliates     296  
Investments, ending balance 1,551   1,551  
Other Affiliates | FE Concepts, LLC        
Schedule Of Equity Method Investments [Line Items]        
Investments, beginning balance     18,273  
Equity in loss of affiliates     788  
Investments, ending balance 19,061   19,061  
Other Affiliates | Other Investments        
Schedule Of Equity Method Investments [Line Items]        
Investments, beginning balance     453  
Other     44  
Investments, ending balance $ 497   $ 497