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Summary of Activity for Each of Company's Other Investments (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investments, beginning balance |  |  | $ 120,045 |  |  |  |
Equity in income (loss) |  |  | 39,242 |  | $ 35,985 | $ 31,962 |
Cash distributions received | [1] |  | (30,143) |  | (25,973) | (21,916) |
Investments, ending balance |  |  | 156,766 |  | 120,045 |  |
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 |  |  | 120,045 |  | 98,317 | 94,973 |
Cash contributions |  |  | 22,076 |  | 3,715 | 1,132 |
Equity in income (loss) |  |  | 25,400 |  | 26,435 | 22,615 |
Equity in comprehensive income (loss) |  |  | (139) |  | 248 | 89 |
Sale of investment | [2] |  |  |  |  | (12,900) |
Cash distributions received |  |  | (7,938) |  | (8,615) | (7,698) |
Other |  |  | (2,678) | [3] | (55) | 106 | [3]
Investments, ending balance |  |  | 156,766 |  | 120,045 | 98,317 |
Other Affiliates | Digital Cinema Implementation Partners |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investments, beginning balance |  |  | 106,215 |  | 87,819 | 71,579 |
Cash contributions |  |  | 2,076 |  | 1,112 | 717 |
Equity in income (loss) |  |  | 22,899 |  | 22,900 | 21,434 |
Equity in comprehensive income (loss) |  |  | (139) |  | 248 | 89 |
Cash distributions received |  |  | (5,799) |  | (5,864) | (6,000) |
Investments, ending balance |  |  | 125,252 |  | 106,215 | 87,819 |
Other Affiliates | RealD |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investments, beginning balance |  |  |  |  |  | 12,900 |
Sale of investment | [2] |  |  |  |  | (12,900) |
Other Affiliates | AC JV, LLC |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investments, beginning balance |  |  | 5,916 |  | 5,980 | 7,269 |
Equity in income (loss) |  |  | 1,270 |  | 2,336 | 311 |
Cash distributions received |  |  | (1,920) |  | (2,400) | (1,600) |
Investments, ending balance |  |  | 5,266 |  | 5,916 | 5,980 |
Other Affiliates | Digital Cinema Distribution Coalition |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investments, beginning balance |  |  | 3,598 |  | 2,750 | 2,562 |
Equity in income (loss) |  |  | 1,313 |  | 1,199 | 870 |
Cash distributions received |  |  | (219) |  | (351) | (98) |
Other | [3] |  | (2,437) |  |  | (584) |
Investments, ending balance |  |  | 2,255 |  | 3,598 | 2,750 |
Other Affiliates | FE Concepts, LLC |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investments, beginning balance |  |  | 104 |  |  |  |
Cash contributions |  |  | 20,000 |  | 104 |  |
Equity in income (loss) |  |  | (82) |  |  |  |
Other | [3] |  | (104) |  |  |  |
Investments, ending balance |  |  | 19,918 |  | 104 |  |
Other Affiliates | Other Investments |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investments, beginning balance |  |  | 4,212 |  | 1,768 | 663 |
Cash contributions |  |  |  |  | 2,499 | 415 |
Other |  |  | (137) | [3] | (55) | 690 | [3]
Investments, ending balance |  |  | $ 4,075 |  | $ 4,212 | $ 1,768 |
[1] | Includes distributions received from equity investees that were recorded as a reduction of the respective investment balances.
[2] | See further discussion of the sale of the investment held by the Company under RealD, Inc. below.
[3] | Other activity for DCDC for the years ended December 31, 2016 and 2018 consisted of returns of capital originally contributed by the Company

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