Transactions with DCIP (Detail) - Digital Cinema Implementation Partners - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Schedule Of Equity Method Investments [Line Items]
Equipment lease payments	$ 1,229	$ 1,452	$ 3,689	$ 4,333
Warranty reimbursements from DCIP	(2,791)	(2,234)	(7,909)	(6,141)
Management service fees	$ 180	$ 207	$ 558	$ 619