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Financial Instruments - Additional Information (Details) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	Feb. 28, 2021 USD ($) shares	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Country	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Financial Instruments (Textual) [Abstract]
Cash and cash equivalents			$ 193,008		$ 317,379
Cash held outside of Canada			$ 101,000		89,900
Number of countries that generate box office | Country			85
Foreign Exchange contract settlement date range			settlement dates throughout 2022
Estimated loss to be reclassified to earnings within the next twelve months			$ 200
Investment in equity securities			1,089		13,633
Investment in equity securities - cost			$ 15,200
Equity securities restrictions			lock-up period of six months
Fixed Income Securities [Member]
Financial Instruments (Textual) [Abstract]
Equity Investment, Debt Securities			$ 1,100		1,100
Preferred Stock [Member] | Other Assets [Member]
Financial Instruments (Textual) [Abstract]
Investment in equity securities			$ 1,000		1,000
Maoyan [Member]
Financial Instruments (Textual) [Abstract]
Investment in equity securities					12,600
Gain (loss) in fair value of equity securities		$ 1,600		$ (900)
Number of shares sold | shares	7,949,000
Gross proceeds from sale of investment	$ 17,800
Gain relating to acquisition cost	2,600
Realized gain on fair value of investment	$ 5,200
Maximum [Member]
Financial Instruments (Textual) [Abstract]
Equity securities percentage ownership			1.00%
Republic of China [Member]
Financial Instruments (Textual) [Abstract]
Cash held/undistributed earnings			$ 70,300		$ 77,200

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