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Summary of Goodwill (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |  |  |  |
Beginning Balance | [1] | $ 1,283,371 |  | $ 1,276,324 |
Acquisition of theatres | [2] |  |  | 9,680 |
Impairment | [3] | 16,128 |  |  |
Foreign currency translation adjustments |  | (13,403) |  | (2,633) |
Ending Balance |  | 1,253,840 | [4] | 1,283,371 | [1]
Impairment | [3] | (16,128) |  |  |
U.S. Operating Segment |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Beginning Balance | [1] | 1,182,853 |  | 1,174,041 |
Acquisition of theatres | [2] |  |  | 8,812 |
Ending Balance |  | 1,182,853 | [4] | 1,182,853 | [1]
International Operating Segment |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Beginning Balance | [1] | 100,518 |  | 102,283 |
Acquisition of theatres | [2] |  |  | 868 |
Impairment | [3] | 16,128 |  |  |
Foreign currency translation adjustments |  | (13,403) |  | (2,633) |
Ending Balance |  | 70,987 | [4] | $ 100,518 | [1]
Impairment | [3] | $ (16,128) |  |  |
[1] | Balances are presented net of historical accumulated impairment losses of $214,031 for the U.S. operating segment and $27,622 for the international operating segment
[2] | Amounts represent acquisition of two theatres in the U.S. and final purchase price adjustment for theatres acquired in Brazil during the year ended December 31, 2018.
[3] | See Note 11 for discussion of impairment evaluations performed during the year ended December 31, 2020.
[4] | Balances are presented net of historical accumulated impairment losses of $214,031 for the U.S. operating segment and $43,750 for the international operating segment

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