Transactions with DCIP (Detail) - Digital Cinema Implementation Partners - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule Of Equity Method Investments [Line Items]
Equipment lease payments	$ 1,243	$ 1,511	$ 2,460	$ 2,881
Warranty reimbursements from DCIP	(2,617)	(2,023)	(5,118)	(3,907)
Management service fees	$ 184	$ 206	$ 378	$ 412