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Summary of Activity for Each of Company's Other Investments (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity in income (loss) |  | $ (38,745,000) |  | $ 41,870,000 |  | $ 39,242,000
Cash distributions received |  | (25,430,000) |  | (53,366,000) |  | (30,143,000)
Digital Cinema Implementation Partners |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Cash distributions received | [1] | (10,383,000) |  | (23,696,000) |  | (5,799,000)
Other |  | 12,915,000 |  |  |  |
Other Affiliates |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  | 155,285,000 |  | 156,766,000 |  | 120,045,000
Cash contributions |  | 50,000 |  |  |  | 22,076,000
Equity in income (loss) |  | (28,118,000) |  | 27,278,000 |  | 25,400,000
Equity in comprehensive income (loss) |  |  |  | (141,000) |  | (139,000)
Cash distributions received |  | (11,261,000) |  | (27,422,000) |  | (7,938,000)
Non-cash distribution received | [2] | (89,804,000) |  |  |  |
Other |  | (2,426,000) | [3] | (1,196,000) | [4] | (2,678,000)
Investments, ending balance |  | 23,726,000 |  | 155,285,000 |  | 156,766,000
Other Affiliates | Digital Cinema Implementation Partners |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  | 124,696,000 |  | 125,252,000 |  | 106,215,000
Cash contributions |  | 50,000 |  |  |  | 2,076,000
Equity in income (loss) |  | (24,559,000) |  | 23,281,000 |  | 22,899,000
Equity in comprehensive income (loss) |  |  |  | (141,000) |  | (139,000)
Cash distributions received |  | (10,383,000) |  | (23,696,000) |  | (5,799,000)
Non-cash distribution received | [2] | (89,804,000) |  |  |  |
Investments, ending balance |  |  |  | 124,696,000 |  | 125,252,000
Other Affiliates | AC JV, LLC |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  | 5,022,000 |  | 5,266,000 |  | 5,916,000
Equity in income (loss) |  | (1,277,000) |  | 3,276,000 |  | 1,270,000
Cash distributions received |  |  |  | (3,520,000) |  | (1,920,000)
Investments, ending balance |  | 3,745,000 |  | 5,022,000 |  | 5,266,000
Other Affiliates | Digital Cinema Distribution Coalition |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  | 3,169,000 |  | 2,255,000 |  | 3,598,000
Equity in income (loss) |  | (1,036,000) |  | 1,120,000 |  | 1,313,000
Cash distributions received |  | (878,000) |  | (206,000) |  | (219,000)
Other |  |  |  |  |  | (2,437,000)
Investments, ending balance |  | 1,255,000 |  | 3,169,000 |  | 2,255,000
Other Affiliates | FE Concepts, LLC |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  | 19,519,000 |  | 19,918,000.00 |  | 104,000
Cash contributions |  |  |  |  |  | 20,000,000
Equity in income (loss) |  | (1,246,000) |  | (399,000) |  | (82,000)
Other |  |  |  |  |  | (104,000)
Investments, ending balance |  | 18,273,000 |  | 19,519,000 |  | 19,918,000.00
Other Affiliates | Other Investments |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments, beginning balance |  | 2,879,000 |  | 4,075,000 |  | 4,212,000
Other |  | (2,426,000) | [3] | (1,196,000) | [4] | (137,000)
Investments, ending balance |  | $ 453,000 |  | $ 2,879,000 |  | $ 4,075,000
[1] | See discussion of cash distributions from DCIP, which were recorded as a reduction of the Company’s investment in DCIP, at Note 9. These distributions are reported entirely within the U.S. operating segment.
[2] | Consists of projectors distributed to the Company from DCIP as discussed below.
[3] | Consists primarily of the impairment of a cost method investment (see Note 11 for discussion of impairments recorded) and mark-to-market adjustment on an investment in marketable securities.
[4] | Other activity for DCDC for the year ended December 31, 2018 consisted of returns of capital originally contributed by the Company. Other activity for the year ended December 31, 2019 consists primarily of and mark-to-market adjustment on an investment in marketable securities.

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