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, 2020	Sep. 30, 2020
Accounts Receivable Allowance For Credit Loss [Line Items]
Beginning balance	$ 12,610	$ 5,137
Current period provision	1,829	9,506
Write-offs	(614)	(614)
Foreign exchange	308	104
Ending balance	14,133	14,133
Theatre Operators [Member]
Accounts Receivable Allowance For Credit Loss [Line Items]
Beginning balance	6,317	3,302
Current period provision	1,623	4,718
Write-offs	(614)	(614)
Foreign exchange	133	53
Ending balance	7,459	7,459
Studios [Member]
Accounts Receivable Allowance For Credit Loss [Line Items]
Beginning balance	5,455	893
Current period provision	(262)	4,424
Foreign exchange	184	60
Ending balance	5,377	5,377
Other [Member]
Accounts Receivable Allowance For Credit Loss [Line Items]
Beginning balance	838	942
Current period provision	468	364
Foreign exchange	(9)	(9)
Ending balance	$ 1,297	$ 1,297