Summary Financial Information for DCIP (Detail) - Other Affiliates - Digital Cinema Implementation Partners - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items]
Gross revenues	$ 48,007	$ 42,521	$ 85,671	$ 83,554
Operating income	30,573	25,049	50,781	48,494
Net income	28,475	$ 22,169	46,960	$ 43,703
Current assets	65,824		65,824		$ 57,907
Noncurrent assets	634,805		634,805		684,545
Current liabilities	67,479		67,479		67,408
Noncurrent liabilities	57,157		57,157		125,596
Members' equity	$ 575,993		$ 575,993		$ 549,448