Current Expected Credit Losses - Summary of Allowance For Credit Losses Related to Variable Consideration Receivables (Details) - Theatre Operators [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounts Receivable Allowance For Credit Loss [Line Items]
Beginning balance	$ 1,887
Current period provision	200	$ 875
Foreign Exchange	1
Ending balance	$ 2,088	$ 875