Summary of Activity for Each of Company's Other Investments (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		$ 23,726
Equity in income (loss)		(25,045)	$ (38,745)		$ 41,870
Cash distributions from DCIP		(156)	(25,430)		(53,366)
Investments, ending balance		25,205	23,726
Digital Cinema Implementation Partners
Schedule Of Equity Method Investments [Line Items]
Cash distributions from DCIP	[1]	(13,139)	(10,383)	[2]	(23,696)	[2]
Non-cash distribution received	[3]		12,915
Other			12,915
Other Affiliates
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		23,726	155,285		156,766
Cash contributions			50
Equity in income (loss)		1,554	(28,118)		27,278
Equity in comprehensive income (loss)					(141)
Cash distributions from DCIP			(11,261)		(27,422)
Non-cash distribution received	[4]		(89,804)
Other		(75)	(2,426)	[5]	(1,196)	[6]
Investments, ending balance		25,205	23,726		155,285
Other Affiliates | Digital Cinema Implementation Partners
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance			124,696		125,252
Cash contributions			50
Equity in income (loss)			(24,559)		23,281
Equity in comprehensive income (loss)					(141)
Cash distributions from DCIP			(10,383)		(23,696)
Non-cash distribution received	[4]		(89,804)
Investments, ending balance					124,696
Other Affiliates | AC JV, LLC
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		3,745	5,022		5,266
Equity in income (loss)		(34)	(1,277)		3,276
Cash distributions from DCIP					(3,520)
Investments, ending balance		3,711	3,745		5,022
Other Affiliates | Digital Cinema Distribution Coalition
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		1,255	3,169		2,255
Equity in income (loss)		583	(1,036)		1,120
Cash distributions from DCIP			(878)		(206)
Investments, ending balance		1,838	1,255		3,169
Other Affiliates | FE Concepts, LLC
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		18,273	19,519		19,918
Equity in income (loss)		1,005	(1,246)		(399)
Investments, ending balance		19,278	18,273		19,519
Other Affiliates | Other Investments
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		453	2,879		4,075
Other		(75)	(2,426)	[5]	(1,196)	[6]
Investments, ending balance		$ 378	$ 453		$ 2,879

[1] Recorded as a reduction in the Company's investment in DCIP for the years ended December 31, 2019 and 2020. Recorded in cash distributions from DCIP on the consolidated statements of income (loss) for the year ended December 31, 2021. See discussion at Distribution of Projectors from DCIP above.

[2] See discussion of cash distributions from DCIP, which were recorded as a reduction of the Company’s investment in DCIP for the years ended December 31, 2019 and 2020, in Note 9. These distributions are reported entirely within the U.S. operating segment.

[3] Recorded as non-cash distributions from DCIP on the consolidated statements of income (loss). See discussion at Distribution of Projectors from DCIP above.

[4] Consists of projectors distributed to the Company from DCIP as discussed below.

[5] Consists primarily of the impairment of a cost method investment in the year ended December 31, 2020 (see Note 11 for discussion of impairments recorded) and mark-to-market adjustment on an investment in marketable securities.

[6] primarily of mark-to-market adjustment on an investment in marketable securities.