Financial Instruments - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) Country	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Country	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Financial Instruments (Textual) [Abstract]
Significant transfers into/out of Level 3	$ 0	$ 0	$ 0	$ 0
Financing receivables indications of theaters with potential collection concerns			60-89 days
Financing receivables indications of theaters to review and assess			Once a theater’s aging exceeds 90 days, the Company’s policy is to review and assess collectibility on the theater’s past due accounts.
Financing receivables indications of theaters with potential impairment			Over 90 days past due is used by the Company as an indicator of potential impairment as invoices up to 90 days outstanding could be considered reasonable due to the time required for dispute resolution or for the provision of further information or supporting documentation to the customer.
Number of countries that generate box office | Country	81		81
Foreign Exchange contract settlement date range			settlement dates throughout 2019, 2020 and 2021
Estimated losses to be reclassified to earnings within the next twelve months			$ (400,000)
Financial Instruments Additional (Textual) [Abstract]
Convertible loan receivable	$ 1,500,000		$ 1,500,000
Convertible loan receivable, term			3 years
Convertible loan effective interest rate			5.00%
Total carrying value of investments in new business ventures	2,500,000		$ 2,500,000		$ 3,500,000
Investment classified as equity security - cost	15,200,000		15,200,000
Investment classified as equity security - fair value	13,659,000		$ 13,659,000		1,022,000
Equity securities restrictions			lock-up period of six months
Movements in fair value of financial instruments	490,000	0	$ 2,543,000	0
Maximum [Member]
Financial Instruments Additional (Textual) [Abstract]
Equity securities percentage ownership			1.00%
Fixed Income Securities [Member]
Financial Instruments Additional (Textual) [Abstract]
Equity Investment, Debt Securities	1,000,000.0		$ 1,000,000.0		1,000,000.0
Preferred Stock [Member]
Financial Instruments Additional (Textual) [Abstract]
Investment classified as equity security - cost	3,500,000		3,500,000
Investment classified as equity security - fair value	1,000,000.0		1,000,000.0		1,000,000.0
Preferred Stock of Business Venture [Member]
Financial Instruments Additional (Textual) [Abstract]
Equity Investment, Debt Securities	1,500,000		1,500,000
Investment classified as equity security - fair value	0		0		0
Variable Interest Entity, Not Primary Beneficiary [Member] | Equity Accounted Investment [Member]
Financial Instruments Additional (Textual) [Abstract]
Carrying value of investments accounted for under the equity method of accounting	0		0		$ 0
Equity method investment, difference between carrying amount and underlying equity	1,500,000		1,500,000
Gross revenues of investment new business ventures	1,100,000	300,000	1,800,000	1,800,000
Cost of revenue of investment new business ventures	700,000	1,000,000.0	1,100,000	2,700,000
Net loss on equity-accounted investments	$ 300,000	$ 600,000	$ 1,100,000	$ 1,600,000