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Related Parties (Narrative) (Details) |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |
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Nov. 06, 2020 USD ($) | Oct. 01, 2020 USD ($) | Mar. 13, 2020 USD ($) item | Mar. 12, 2020 | Aug. 31, 2016 USD ($) | Jan. 01, 2015 | Jun. 28, 2007 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2012 USD ($) | Mar. 29, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jan. 01, 2019 USD ($) | Feb. 28, 2015 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating property |  |  |  |  |  |  |  | $ 353,125,000 | $ 258,138,000 |  |  |  |  |  |  | $ 258,037,000 |
Operating lease liabilities - current |  |  |  |  |  |  |  | 22,699,000 | 20,379,000 |  |  |  |  |  |  | $ 245,280,000 |
Contributions from noncontrolling stockholders |  |  |  |  |  |  |  | 55,000 | 90,000 | $ 82,000 |  |  |  |  |  |  |
Renovation amount |  |  |  |  |  |  |  | 253,419,000 | 149,852,000 |  |  |  |  |  |  |  |
Capital call |  |  |  |  |  |  |  | 0 | 0 | 0 | $ 506,000 |  |  |  |  |  |
Contractual facility |  |  |  |  |  |  |  | 300,449,000 | 283,138,000 |  |  |  |  |  |  |  |
Rent charge |  |  |  |  |  |  |  | 302,910,000 |  |  |  |  |  |  |  |  |
Proceeds from contributions |  | $ 750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US Cinema 1, 2, 3 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual facility |  |  | $ 25,000,000.0 |  | $ 20,000,000.0 |  |  | $ 24,625,000 | $ 18,658,000 |  |  |  |  |  |  |  |
Maturity date |  |  | Apr. 01, 2022 |  | Mar. 01, 2021 |  |  | Apr. 01, 2022 | Apr. 01, 2022 |  |  |  |  |  |  |  |
Number of extension options | item |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension period |  |  | 6 months |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 4.25% |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |
Shadow View Land And Farming, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Sutton Hill Properties, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of distributions |  | 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sutton Hill Properties, LLC [Member] | US Cinema 1, 2, 3 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual facility |  |  |  |  | $ 15,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Cinemas 1, 2, 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Improvement fee |  |  |  |  |  |  |  |  | $ 96,000 | 425,000 |  |  |  |  |  |  |
Management fee |  |  |  |  |  |  |  |  |  |  |  | $ 177,000 |  |  |  |  |
Incremental positive cash flow percentage |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Average annual positive cash flow period |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |
Annual cash-on-cash return percent |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |
Sutton Hill Capital, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease expiration date |  |  |  |  |  |  |  | Jun. 30, 2020 |  |  |  |  |  |  |  |  |
Payment to acquire interest in special purpose entity |  |  |  |  |  |  | $ 3,000,000.0 |  |  |  |  |  |  |  |  |  |
Management fee | $ 112,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt amount |  |  |  |  |  |  | 26,900,000 |  |  |  |  |  |  |  |  |  |
Due from related party |  |  |  |  |  |  | $ 2,900,000 |  |  |  |  |  |  |  |  |  |
Renovation amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000
Capital call |  |  |  |  |  |  |  |  |  |  | $ 169,000 |  |  |  |  |  |
Guarantee and indemnity percentage |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |
Rent charge |  |  |  |  |  |  |  | $ 590,000 |  |  |  |  |  |  |  |  |
Lease payment |  |  |  |  |  |  |  | 148,000 | 590,000 | 590,000 |  |  |  |  |  |  |
Deferred rent |  |  |  |  |  |  |  | $ 442,000 |  |  |  |  |  |  |  |  |
Sutton Hill Capital, LLC [Member] | Sutton Hill Properties, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of distributions |  | $ 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sutton Hill Capital, LLC [Member] | Cinemas 1, 2, 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of management fee equal to SHP's gross income |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |
Sutton Hill Capital's Interest In Sutton Hill Properties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special purpose entity purchase option, percentage |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |
James Cotter And Michael Forman [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in live theater play investment |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |
Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions from noncontrolling stockholders |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,500,000 |  |  |  |
Bonus contributed to acquire land |  |  |  |  |  |  |  |  |  |  |  |  | $ 255,000 |  |  |  |
Chief Executive Officer [Member] | Shadow View Land And Farming, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Percentage of costs associated with acquisition |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Cinema Ground Lease [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease expiration date |  |  |  |  |  |  |  | Jun. 01, 2031 |  |  |  |  |  |  |  |  |
86th Street Cinema [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fee |  |  |  |  |  |  |  | $ 0 | $ 45,000 | $ 172,000 |  |  |  |  |  |  |
Village East Cinema [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease expiration date |  |  |  | Jan. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Lease term |  |  |  |  |  |  |  | 13 years |  |  |  |  |  |  |  |  |
Operating lease liabilities - current |  |  |  |  |  |  |  | $ 0.0 |  |  |  |  |  |  |  |  |
Village East Cinema [Member] | Sutton Hill Capital, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease term |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |
Purchase option |  |  |  |  |  |  |  | $ 5,900,000 |  |  |  |  |  |  | $ 5,900,000 |  |
Total operating property |  |  |  |  |  |  |  | 4,700,000 |  |  |  |  |  |  |  |  |
Operating lease liabilities - current |  |  |  |  |  |  |  | $ 5,900,000 |  |  |  |  |  |  |  |  |
Village East Cinema [Member] | Sutton Hill Capital, LLC [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase option |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,900,000 |  |  |
Valley Nattional Bank [Member] | US Cinema 1, 2, 3 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual facility |  |  | $ 25,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  | Apr. 01, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of extension options | item |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension period |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 4.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extended maturity date |  |  | Apr. 01, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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