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Summary of Activity for Each of Company's Other Investments (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  | $ 23,726 |  |  |  |
Equity in income (loss) |  | (25,045) | $ (38,745) |  | $ 41,870 |
Cash distributions from DCIP |  | (156) | (25,430) |  | (53,366) |
Investments, ending balance |  | 25,205 | 23,726 |  |  |
Digital Cinema Implementation Partners |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Cash distributions from DCIP | [1] | (13,139) | (10,383) | [2] | (23,696) | [2]
Non-cash distribution received | [3] |  | 12,915 |  |  |
Other |  |  | 12,915 |  |  |
Other Affiliates |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  | 23,726 | 155,285 |  | 156,766 |
Cash contributions |  |  | 50 |  |  |
Equity in income (loss) |  | 1,554 | (28,118) |  | 27,278 |
Equity in comprehensive income (loss) |  |  |  |  | (141) |
Cash distributions from DCIP |  |  | (11,261) |  | (27,422) |
Non-cash distribution received | [4] |  | (89,804) |  |  |
Other |  | (75) | (2,426) | [5] | (1,196) | [6]
Investments, ending balance |  | 25,205 | 23,726 |  | 155,285 |
Other Affiliates | Digital Cinema Implementation Partners |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  |  | 124,696 |  | 125,252 |
Cash contributions |  |  | 50 |  |  |
Equity in income (loss) |  |  | (24,559) |  | 23,281 |
Equity in comprehensive income (loss) |  |  |  |  | (141) |
Cash distributions from DCIP |  |  | (10,383) |  | (23,696) |
Non-cash distribution received | [4] |  | (89,804) |  |  |
Investments, ending balance |  |  |  |  | 124,696 |
Other Affiliates | AC JV, LLC |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  | 3,745 | 5,022 |  | 5,266 |
Equity in income (loss) |  | (34) | (1,277) |  | 3,276 |
Cash distributions from DCIP |  |  |  |  | (3,520) |
Investments, ending balance |  | 3,711 | 3,745 |  | 5,022 |
Other Affiliates | Digital Cinema Distribution Coalition |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  | 1,255 | 3,169 |  | 2,255 |
Equity in income (loss) |  | 583 | (1,036) |  | 1,120 |
Cash distributions from DCIP |  |  | (878) |  | (206) |
Investments, ending balance |  | 1,838 | 1,255 |  | 3,169 |
Other Affiliates | FE Concepts, LLC |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  | 18,273 | 19,519 |  | 19,918 |
Equity in income (loss) |  | 1,005 | (1,246) |  | (399) |
Investments, ending balance |  | 19,278 | 18,273 |  | 19,519 |
Other Affiliates | Other Investments |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  | 453 | 2,879 |  | 4,075 |
Other |  | (75) | (2,426) | [5] | (1,196) | [6]
Investments, ending balance |  | $ 378 | $ 453 |  | $ 2,879 |
[1] | Recorded as a reduction in the Company's investment in DCIP for the years ended December 31, 2019 and 2020. Recorded in cash distributions from DCIP on the consolidated statements of income (loss) for the year ended December 31, 2021. See discussion at Distribution of Projectors from DCIP above.
[2] | See discussion of cash distributions from DCIP, which were recorded as a reduction of the Company’s investment in DCIP for the years ended December 31, 2019 and 2020, in Note 9. These distributions are reported entirely within the U.S. operating segment.
[3] | Recorded as non-cash distributions from DCIP on the consolidated statements of income (loss). See discussion at Distribution of Projectors from DCIP above.
[4] | Consists of projectors distributed to the Company from DCIP as discussed below.
[5] | Consists primarily of the impairment of a cost method investment in the year ended December 31, 2020 (see Note 11 for discussion of impairments recorded) and mark-to-market adjustment on an investment in marketable securities.
[6] | primarily of mark-to-market adjustment on an investment in marketable securities.

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