Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.1
Summary of Activity for Each of Company's Other Investments (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Schedule Of Equity Method Investments [Line Items]    
Investments, beginning balance $ 23,726  
Equity in loss (6,806) $ 8,486
Investments, ending balance 23,932  
Other Affiliates    
Schedule Of Equity Method Investments [Line Items]    
Investments, beginning balance 23,726  
Equity in loss (458)  
Other 664  
Investments, ending balance 23,932  
Other Affiliates | AC JV, LLC    
Schedule Of Equity Method Investments [Line Items]    
Investments, beginning balance 3,745  
Equity in loss (453)  
Investments, ending balance 3,292  
Other Affiliates | Digital Cinema Distribution Coalition    
Schedule Of Equity Method Investments [Line Items]    
Investments, beginning balance 1,255  
Equity in loss 16  
Investments, ending balance 1,271  
Other Affiliates | FE Concepts, LLC    
Schedule Of Equity Method Investments [Line Items]    
Investments, beginning balance 18,273  
Equity in loss (21)  
Investments, ending balance 18,252  
Other Affiliates | Other Investments    
Schedule Of Equity Method Investments [Line Items]    
Investments, beginning balance 453  
Other 664  
Investments, ending balance $ 1,117