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Summary of Activity for Each of Company's Other Investments (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  |  |  |  | $ 98,317 |
Cash distributions | [1] |  | $ (2,402) | $ (1,391) | (17,321) | $ (9,660)
Equity in income |  |  | 10,902 | 12,390 | 26,767 | 24,597
Equity in other comprehensive income |  |  | (11) | $ (7) | 92 | $ (183)
Investments, ending balance |  |  | 112,878 |  | 112,878 |
AC JV, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Cash contributions |  | $ 268 |  |  |  |
Other Affiliates |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  |  |  |  | 98,317 |
Cash contributions |  |  |  |  | 1,177 |
Cash distributions |  |  |  |  | (5,212) |
Equity in income |  |  |  |  | 18,669 |
Equity in other comprehensive income |  |  |  |  | 92 |
Other |  |  |  |  | (165) |
Investments, ending balance |  |  | 112,878 |  | 112,878 |
Other Affiliates | Digital Cinema Implementation Partners |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  |  |  |  | 87,819 |
Cash contributions |  |  |  |  | 1,109 |
Cash distributions |  |  |  |  | (5,212) |
Equity in income |  |  |  |  | 16,820 |
Equity in other comprehensive income |  |  |  |  | 92 |
Other |  |  |  |  | 0 |
Investments, ending balance |  |  | 100,628 |  | 100,628 |
Other Affiliates | AC JV, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  |  |  |  | 5,980 |
Cash contributions |  |  |  |  | 0 |
Cash distributions |  |  |  |  | 0 |
Equity in income |  |  |  |  | 996 |
Equity in other comprehensive income |  |  |  |  | 0 |
Other |  |  |  |  | 0 |
Investments, ending balance |  |  | 6,976 |  | 6,976 |
Other Affiliates | Digital Cinema Distribution Coalition |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  |  |  |  | 2,750 |
Cash contributions |  |  |  |  | 0 |
Cash distributions |  |  |  |  | 0 |
Equity in income |  |  |  |  | 853 |
Equity in other comprehensive income |  |  |  |  | 0 |
Other |  |  |  |  | 0 |
Investments, ending balance |  |  | 3,603 |  | 3,603 |
Other Affiliates | Other Investments |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  |  |  |  | 1,768 |
Cash contributions |  |  |  |  | 68 |
Cash distributions |  |  |  |  | 0 |
Equity in income |  |  |  |  | 0 |
Equity in other comprehensive income |  |  |  |  | 0 |
Other |  |  |  |  | (165) |
Investments, ending balance |  |  | $ 1,671 |  | $ 1,671 |
[1] | Includes cash distributions received from equity investees that were recorded as a reduction of the respective investment balances (see Notes 6 and 7). These distributions are reported entirely within the U.S. operating segment.

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