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Other Investments - Additional Information (Detail) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 6 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 22, 2016 USD ($) $ / shares | Dec. 31, 2013 USD ($) | Mar. 31, 2011 $ / shares | Jun. 30, 2016 USD ($) ProjectionSystem | Jun. 30, 2015 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2011 shares
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of options to purchase common stock | shares |  |  |  |  |  |  | 1,222,780
Exercise price of options, per share | $ / shares |  |  | $ 0.00667 |  |  |  |
Other Affiliates |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Cash contributions |  |  |  | $ 1,061 |  |  |
Other Affiliates | 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 |  |  |  | 3,787 |  |  |
Cash contributions |  |  |  | $ 61 |  |  |
Other Affiliates | RealD |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Purchase price per share | $ / shares | $ 11.00 |  |  |  |  |  |
Investments shares sold | $ 13,451 |  |  |  |  |  |
Gain on investment |  |  |  | 3,742 |  |  |
Unrealized holding gain previously recorded in AOCI |  |  |  | 3,191 |  |  |
Other Affiliates | 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 |  |  |  | 5,555 |  |  |
Other Affiliates | AC JV, LLC | Film rentals and advertising |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Event fees |  |  |  | $ 5,234 | $ 5,970 |  |
Other Affiliates | Digital Cinema Distribution Coalition |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Percentage of voting interest |  |  |  | 14.60% |  |  |
Payments for content delivery services |  |  |  | $ 465 | $ 390 |  |

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