Summary of Activity for Each of Investments (Detail) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
		Dec. 31, 2013	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Schedule of Equity Method Investments [Line Items]
Investments, beginning balance					$ 94,973
Equity in income of affiliates			$ 5,065	$ 4,086	12,207	$ 9,325
Equity in comprehensive loss			146	$ (3,322)	(176)	$ (2,938)
Investments, ending balance			93,099		93,099
Other Affiliates
Schedule of Equity Method Investments [Line Items]
Investments, beginning balance					94,973
Cash contributions					1,061
Equity in income of affiliates					10,362
Equity in comprehensive loss					(176)
Sale of investment	[1]				(12,900)
Other					(221)
Investments, ending balance			93,099		93,099
Digital Cinema Implementation Partners | Other Affiliates
Schedule of Equity Method Investments [Line Items]
Investments, beginning balance					71,579
Cash contributions					61
Equity in income of affiliates					9,622
Equity in comprehensive loss					(176)
Other					(359)
Investments, ending balance			80,727		80,727
RealD | Other Affiliates
Schedule of Equity Method Investments [Line Items]
Investments, beginning balance					12,900
Sale of investment	[1]				(12,900)
AC JV, LLC | Other Affiliates
Schedule of Equity Method Investments [Line Items]
Investments, beginning balance					7,269
Cash contributions		$ 268
Equity in income of affiliates					128
Investments, ending balance			7,397		7,397
Digital Cinema Distribution Coalition | Other Affiliates
Schedule of Equity Method Investments [Line Items]
Investments, beginning balance					2,562
Equity in income of affiliates					612
Investments, ending balance			3,174		3,174
Other Investment | Other Affiliates
Schedule of Equity Method Investments [Line Items]
Investments, beginning balance					663
Cash contributions					1,000
Other					138
Investments, ending balance			$ 1,801		$ 1,801

[1] See further discussion of the sale of the investment held by the Company under RealD, Inc. below.