Quarterly report pursuant to Section 13 or 15(d)

Other Investments - Additional Information (Detail)

v3.8.0.1
Other Investments - Additional Information (Detail)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2013
USD ($)
Sep. 30, 2017
USD ($)
ProjectionSystem
Sep. 30, 2016
USD ($)
Dec. 31, 2013
USD ($)
Digital Cinema Implementation Partners        
Schedule of Equity Method Investments [Line Items]        
Percentage of voting interest   33.00%    
Economic interest in Digital Cinema Implementation Partners   24.30%    
Number of equipment being leased under master equipment lease agreement | ProjectionSystem   3,796    
AC JV, LLC        
Schedule of Equity Method Investments [Line Items]        
Ownership of class A units sold to Founding Members 97.00%      
Cash contributions $ 268      
Ownership of class A units 1.00%      
Ownership of class A units       31.00%
Aggregate value of Class A units       $ 25,000
Promissory note term       6 years
Original principal value of promissory note with NCM       $ 8,333
Annual interest rate on promissory note 5.00%     5.00%
Remaining outstanding balance of note payable   $ 4,167    
AC JV, LLC | Film rentals and advertising        
Schedule of Equity Method Investments [Line Items]        
Event fees   $ 9,448 $ 7,808  
Digital Cinema Distribution Coalition        
Schedule of Equity Method Investments [Line Items]        
Percentage of voting interest   14.60%    
Payments for content delivery services   $ 637 $ 707