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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Investments, beginning balance |  |  | $ 98,317 |  |
Equity in income of affiliates |  |  | 35,985 | $ 31,962 | $ 28,126
Cash distributions received | [1] |  | (25,973) | (21,916) | (19,027)
Investments, ending balance |  |  | 120,045 | 98,317 |
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 | 94,973 | 77,658
Cash contributions |  |  | 3,715 | 1,132 | 3,711
Equity in income of affiliates |  |  | 26,435 | 22,615 | 19,616
Equity in comprehensive income (loss) |  |  | 248 | 89 | (384)
Unrealized holding loss |  |  |  |  | (1,529)
Sale of investment in Taiwan | [2] |  |  |  | (1,383)
Sale of investment | [3] |  |  | (12,900) |
Cash distributions received |  |  | (8,615) | (7,698) | (2,647)
Other |  |  | (55) | 106 | (69)
Investments, ending balance |  |  | 120,045 | 98,317 | 94,973
Other Affiliates | Digital Cinema Implementation Partners |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Investments, beginning balance |  |  | 87,819 | 71,579 | 51,277
Cash contributions |  |  | 1,112 | 717 | 3,211
Equity in income of affiliates |  |  | 22,900 | 21,434 | 18,522
Equity in comprehensive income (loss) |  |  | 248 | 89 | (384)
Cash distributions received |  |  | (5,864) | (6,000) | (1,047)
Investments, ending balance |  |  | 106,215 | 87,819 | 71,579
Other Affiliates | RealD |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Investments, beginning balance |  |  |  | 12,900 | 14,429
Unrealized holding loss |  |  |  |  | (1,529)
Sale of investment | [3] |  |  | (12,900) |
Investments, ending balance |  |  |  |  | 12,900
Other Affiliates | AC JV, LLC |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Investments, beginning balance |  |  | 5,980 | 7,269 | 7,899
Equity in income of affiliates |  |  | 2,336 | 311 | 970
Cash distributions received |  |  | (2,400) | (1,600) | (1,600)
Investments, ending balance |  |  | 5,916 | 5,980 | 7,269
Other Affiliates | Digital Cinema Distribution Coalition |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Investments, beginning balance |  |  | 2,750 | 2,562 | 2,438
Equity in income of affiliates |  |  | 1,199 | 870 | 124
Cash distributions received |  |  | (351) | (98) |
Other |  |  |  | (584) |
Investments, ending balance |  |  | 3,598 | 2,750 | 2,562
Other Affiliates | Other Investment |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Investments, beginning balance |  |  | 1,768 | 663 | 1,615
Cash contributions |  |  | 2,603 | 415 | 500
Sale of investment in Taiwan | [2] |  |  |  | (1,383)
Other |  |  | (55) | 690 | (69)
Investments, ending balance |  |  | $ 4,316 | $ 1,768 | $ 663
[1] | Includes distributions received from equity investees that were recorded as a reduction of the respective investment balances.
[2] | The Company sold its investment in a Taiwan joint venture for $2,634, resulting in a gain of $1,251, which is included in loss on sale of assets and other for the year ended December 31, 2015.
[3] | See further discussion of the sale of the investment held by the Company under RealD, Inc. below.

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