Transactions with DCIP (Detail) - Digital Cinema Implementation Partners - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Equity Method Investments [Line Items]
Equipment lease payments	$ 4,862	$ 5,743	$ 5,217
Warranty reimbursements from DCIP	(10,800)	(8,511)	(6,091)
Management services fees	$ 730	$ 823	$ 825