Current Expected Credit Losses - Summary of Allowance For Credit Losses Related to Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounts Receivable Allowance For Credit Loss [Line Items]
Beginning balance	$ 12,306	$ 12,610	$ 14,295	$ 5,137
Current period provision (reversal), net	(764)	1,829	(2,308)	9,506
Write-offs	(313)	(614)	(800)	(614)
Foreign exchange	(87)	308	(45)	104
Ending balance	11,142	14,133	11,142	14,133
Theatre Operators [Member]
Accounts Receivable Allowance For Credit Loss [Line Items]
Beginning balance	8,597	6,317	8,368	3,302
Current period provision (reversal), net	(489)	1,623	(111)	4,718
Write-offs	(43)	(614)	(278)	(614)
Foreign exchange	(89)	133	(3)	53
Ending balance	7,976	7,459	7,976	7,459
Studios [Member]
Accounts Receivable Allowance For Credit Loss [Line Items]
Beginning balance	2,517	5,455	4,481	893
Current period provision (reversal), net	(251)	(262)	(1,928)	4,424
Write-offs	(270)		(522)
Foreign exchange	2	184	(33)	60
Ending balance	1,998	5,377	1,998	5,377
Other [Member]
Accounts Receivable Allowance For Credit Loss [Line Items]
Beginning balance	1,192	838	1,446	942
Current period provision (reversal), net	(24)	468	(269)	364
Foreign exchange		(9)	(9)	(9)
Ending balance	$ 1,168	$ 1,297	$ 1,168	$ 1,297