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Other Investments - Additional Information (Detail) $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2013 USD ($) | Sep. 30, 2015 USD ($) ProjectionSystem shares | Sep. 30, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of shares owned in RealD | shares |  | 1,222,780 |  |  |
Book value of investment |  | $ 89,059 |  |  | $ 77,658
RealD |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Book value of investment |  | 11,751 |  |  | $ 14,429
RealD | Utilities and other |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Licensing fees |  | $ 11,054 | $ 12,897 |  |
Digital Cinema Implementation Partners LLC |  |  |  |  |
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 |  | 3,750 |  |  |
Equipment lease expense |  | $ 3,133 | 3,005 |  |
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 |
Aggregate value of promissory note |  |  |  | $ 8,333 |
Annual interest rate on promissory note | 5.00% |  |  | 5.00% |
AC JV, LLC | Film rentals and advertising |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Event fees |  | $ 9,031 | 0 |  |
Digital Cinema Distribution Coalition |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Percentage of voting interest |  | 14.60% |  |  |
Payments for content delivery services |  | $ 542 | $ 589 |  |

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