Annual report pursuant to Section 13 and 15(d)

Summary of Activity for Each of Company's Other Investments (Detail)

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Summary of Activity for Each of Company's Other Investments (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Equity Method Investments [Line Items]      
Investments, beginning balance $ 156,766,000    
Equity in income (loss) 41,870,000 $ 39,242,000 $ 35,985,000
Cash distributions received (53,366,000) (30,143,000) (25,973,000)
Investments, ending balance 155,285,000 156,766,000  
Digital Cinema Implementation Partners      
Schedule Of Equity Method Investments [Line Items]      
Cash distributions received [1] (23,696,000) (5,799,000) (5,864,000)
Other Affiliates      
Schedule Of Equity Method Investments [Line Items]      
Investments, beginning balance 156,766,000 120,045,000 98,317,000
Cash contributions   22,076,000 3,715,000
Equity in income (loss) 27,278,000 25,400,000 26,435,000
Equity in comprehensive income (loss) (141,000) (139,000) 248,000
Cash distributions received (27,422,000) (7,938,000) (8,615,000)
Other (1,196,000) [2] (2,678,000) [3] (55,000)
Investments, ending balance 155,285,000 156,766,000 120,045,000
Other Affiliates | Digital Cinema Implementation Partners      
Schedule Of Equity Method Investments [Line Items]      
Investments, beginning balance 125,252,000 106,215,000 87,819,000
Cash contributions   2,076,000 1,112,000
Equity in income (loss) 23,281,000 22,899,000 22,900,000
Equity in comprehensive income (loss) (141,000) (139,000) 248,000
Cash distributions received (23,696,000) (5,799,000) (5,864,000)
Investments, ending balance 124,696,000 125,252,000 106,215,000
Other Affiliates | AC JV, LLC      
Schedule Of Equity Method Investments [Line Items]      
Investments, beginning balance 5,266,000 5,916,000 5,980,000
Equity in income (loss) 3,276,000 1,270,000 2,336,000
Cash distributions received (3,520,000) (1,920,000) (2,400,000)
Investments, ending balance 5,022,000 5,266,000 5,916,000
Other Affiliates | Digital Cinema Distribution Coalition      
Schedule Of Equity Method Investments [Line Items]      
Investments, beginning balance 2,255,000 3,598,000 2,750,000
Equity in income (loss) 1,120,000 1,313,000 1,199,000
Cash distributions received (206,000) (219,000) (351,000)
Other [3]   (2,437,000)  
Investments, ending balance 3,169,000 2,255,000 3,598,000
Other Affiliates | FE Concepts, LLC      
Schedule Of Equity Method Investments [Line Items]      
Investments, beginning balance 19,918,000 104,000.00  
Cash contributions   20,000,000 104,000
Equity in income (loss) (399,000) (82,000)  
Other [3]   (104,000)  
Investments, ending balance 19,519,000 19,918,000 104,000.00
Other Affiliates | Other Investments      
Schedule Of Equity Method Investments [Line Items]      
Investments, beginning balance 4,075,000 4,212,000 1,768,000
Cash contributions     2,499,000
Other (1,196,000) [2] (137,000) [3] (55,000)
Investments, ending balance $ 2,879,000 $ 4,075,000 $ 4,212,000
[1] See discussion of cash distributions from DCIP, which were recorded as a reduction of the Company’s investment in DCIP, at Note 8.  These distributions are reported entirely within the U.S. operating segment.
[2] Consists primarily of mark-to-market adjustment on an investment in marketable securities.
[3] Other activity for DCDC for the year ended December 31, 2018 consisted of returns of capital originally contributed by the Company