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Summary of Long-Lived Asset Impairment Losses (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Impairment | [1] | $ 16,128 |  |
Total impairment |  | 152,706 | $ 57,001 | $ 32,372
Investment In NCM |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Total impairment |  | (92,655) |  |
U.S. Operating Segment |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Theatre properties |  | 12,398 | 36,005 | 18,597
Theatre operating lease right-of-use assets |  | 13,216 | 10,457 |
Cost method investment |  | 2,500 |  |
Total impairment |  | 120,769 | 46,462 | 18,597
U.S. Operating Segment | Investment In NCM |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Investment | [2] | 92,655 |  |
International Operating Segment |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Theatre properties |  | 9,951 | 8,821 | 13,775
Theatre operating lease right-of-use assets |  | 5,025 | 1,718 |
Impairment | [1] | 16,128 |  |
Intangible assets |  | 833 |  |
Total impairment |  | $ 31,937 | $ 10,539 | $ 13,775
[1] | See Note 11 for discussion of impairment evaluations performed during the year ended December 31, 2020.
[2] | See Note 8 for discussion on NCM impairment.

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