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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Schedule Of Equity Method Investments [Line Items]        
Investments, beginning balance     $ 23,726  
Equity in loss of affiliates $ (8,109) $ (20,120) (14,915) $ (11,634)
Investments, ending balance 23,629   23,629  
Other Affiliates        
Schedule Of Equity Method Investments [Line Items]        
Investments, beginning balance     23,726  
Equity in loss of affiliates     (501)  
Other     404  
Investments, ending balance 23,629   23,629  
Other Affiliates | AC JV, LLC        
Schedule Of Equity Method Investments [Line Items]        
Investments, beginning balance     3,745  
Equity in loss of affiliates     (938)  
Investments, ending balance 2,807   2,807  
Other Affiliates | Digital Cinema Distribution Coalition        
Schedule Of Equity Method Investments [Line Items]        
Investments, beginning balance     1,255  
Equity in loss of affiliates     46  
Investments, ending balance 1,301   1,301  
Other Affiliates | FE Concepts, LLC        
Schedule Of Equity Method Investments [Line Items]        
Investments, beginning balance     18,273  
Equity in loss of affiliates     391  
Investments, ending balance 18,664   18,664  
Other Affiliates | Other Investments        
Schedule Of Equity Method Investments [Line Items]        
Investments, beginning balance     453  
Other     404  
Investments, ending balance $ 857   $ 857