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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 |

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