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Summary of Activity for Each of Company's Other Investments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Investments, beginning balance |  |  |  | $ 120,045 |
Cash distributions received | [1] | $ (4,786) | $ (2,402) | (21,041) | $ (17,321)
Equity in earnings |  | 14,158 | 10,902 | 29,208 | 26,767
Other comprehensive income (loss) in equity method investments |  | (63) | $ (11) | (43) | $ 92
Investments, ending balance |  | 153,101 |  | 153,101 |
Other Affiliates |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Investments, beginning balance |  |  |  | 120,045 |
Cash contributions made |  |  |  | 21,714 |
Cash distributions received |  |  |  | (5,201) |
Equity in earnings |  |  |  | 17,867 |
Other comprehensive income (loss) in equity method investments |  |  |  | (43) |
Other |  |  |  | (1,281) |
Investments, ending balance |  | 153,101 |  | 153,101 |
Other Affiliates | Digital Cinema Implementation Partners |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Investments, beginning balance |  |  |  | 106,215 |
Cash contributions made |  |  |  | 1,714 |
Cash distributions received |  |  |  | (5,201) |
Equity in earnings |  |  |  | 16,378 |
Other comprehensive income (loss) in equity method investments |  |  |  | (43) |
Other |  |  |  | 0 |
Investments, ending balance |  | 119,063 |  | 119,063 |
Other Affiliates | AC JV, LLC |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Investments, beginning balance |  |  |  | 5,916 |
Cash contributions made |  |  |  | 0 |
Cash distributions received |  |  |  | 0 |
Equity in earnings |  |  |  | 648 |
Other comprehensive income (loss) in equity method investments |  |  |  | 0 |
Other |  |  |  | 0 |
Investments, ending balance |  | 6,564 |  | 6,564 |
Other Affiliates | Digital Cinema Distribution Coalition |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Investments, beginning balance |  |  |  | 3,598 |
Cash contributions made |  |  |  | 0 |
Cash distributions received |  |  |  | 0 |
Equity in earnings |  |  |  | 898 |
Other comprehensive income (loss) in equity method investments |  |  |  | 0 |
Other |  |  |  | (1,168) |
Investments, ending balance |  | 3,328 |  | 3,328 |
Other Affiliates | FE Concepts, LLC |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Investments, beginning balance |  |  |  | 104 |
Cash contributions made |  |  |  | 20,000 |
Cash distributions received |  |  |  | 0 |
Equity in earnings |  |  |  | (57) |
Other comprehensive income (loss) in equity method investments |  |  |  | 0 |
Other |  |  |  | (104) |
Investments, ending balance |  | 19,943 |  | 19,943 |
Other Affiliates | Other Investments |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Investments, beginning balance |  |  |  | 4,212 |
Cash contributions made |  |  |  | 0 |
Cash distributions received |  |  |  | 0 |
Equity in earnings |  |  |  | 0 |
Other comprehensive income (loss) in equity method investments |  |  |  | 0 |
Other |  |  |  | (9) |
Investments, ending balance |  | $ 4,203 |  | $ 4,203 |
[1] | Includes cash distributions received from equity investees that were recorded as a reduction of the respective investment balances (see Notes 7 and 8). These distributions are reported entirely within the U.S. operating segment.

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