Current Expected Credit Losses - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Current Expected Credit Losses [Line Items]
Provisions for current expected credit losses	$ 1,829,000		$ 9,506,000
Finance income related to net investment in leases with billed amounts past due	0	$ 0	100,000	$ 100,000
Finance income related to financed sale receivables with billed amounts past due	1,400,000	$ 1,500,000	4,200,000	$ 5,100,000
Theatre And Studio [Member]
Current Expected Credit Losses [Line Items]
Provisions for current expected credit losses	1,800,000		9,500,000
Theatre Operators [Member]
Current Expected Credit Losses [Line Items]
Provisions for current expected credit losses	1,623,000		4,718,000
Provision for current expected credit losses	1,300,000		4,400,000
Provision for current expected credit losses	$ 790,000		$ 1,653,000