Summary of Activity for Each of Company's Other Investments (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		$ 156,766
Cash distributions received	[1]	(14,342)	$ (12,323)
Equity in income		10,404	8,636
Other comprehensive income (loss) in equity method investments		(71)	$ 136
Investments, ending balance		157,458
Other Affiliates
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		156,766
Cash distributions received		(5,218)
Equity in income		6,010
Other comprehensive income (loss) in equity method investments		(71)
Other		(29)
Investments, ending balance		157,458
Other Affiliates | Digital Cinema Implementation Partners
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		125,252
Cash distributions received		(5,218)
Equity in income		4,329
Other comprehensive income (loss) in equity method investments		(71)
Other		0
Investments, ending balance		124,292
Other Affiliates | AC JV, LLC
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		5,266
Cash distributions received		0
Equity in income		1,678
Other comprehensive income (loss) in equity method investments		0
Other		0
Investments, ending balance		6,944
Other Affiliates | Digital Cinema Distribution Coalition
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		2,255
Cash distributions received		0
Equity in income		0
Other comprehensive income (loss) in equity method investments		0
Other		0
Investments, ending balance		2,255
Other Affiliates | FE Concepts, LLC
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		19,918
Cash distributions received		0
Equity in income		3
Other comprehensive income (loss) in equity method investments		0
Other		0
Investments, ending balance		19,921
Other Affiliates | Other Investments
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		4,075
Cash distributions received		0
Equity in income		0
Other comprehensive income (loss) in equity method investments		0
Other		(29)
Investments, ending balance		$ 4,046

[1] Includes cash distributions received from equity investees that were recorded as a reduction of the respective investment balances (see Notes 8 and 9). These distributions are reported entirely within the U.S. operating segment.