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Economic interest in DCIP.

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Equipment lease payments made to DCIP affiliate for leased digital projection equipment.

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The fair value of equity investee for purposes of sale.

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Number of digital projection systems leased under operating lease with DCIP affiliate.

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Number of shares of RealD stock owned by the Company.

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Amounts paid to equity investee for content delivery services.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Other Investments - Additional Information (Detail) $ in Thousands	1 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2013 USD ($)	Sep. 30, 2015 USD ($) ProjectionSystem shares	Sep. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of shares owned in RealD \| shares		1,222,780
Book value of investment		$ 89,059			$ 77,658
RealD
Schedule of Equity Method Investments [Line Items]
Book value of investment		11,751			$ 14,429
RealD \| Utilities and other
Schedule of Equity Method Investments [Line Items]
Licensing fees		$ 11,054	$ 12,897
Digital Cinema Implementation Partners LLC
Schedule of Equity Method Investments [Line Items]
Percentage of voting interest		33.00%
Economic interest in Digital Cinema Implementation Partners		24.30%
Number of equipment being leased under master equipment lease agreement \| ProjectionSystem		3,750
Equipment lease expense		$ 3,133	3,005
AC JV, LLC
Schedule of Equity Method Investments [Line Items]
Ownership of class A units sold to Founding Members	97.00%
Cash contributions	$ 268
Ownership of class A units	1.00%
Ownership of class A units				31.00%
Aggregate value of Class A units				$ 25,000
Promissory note term				6 years
Aggregate value of promissory note				$ 8,333
Annual interest rate on promissory note	5.00%			5.00%
AC JV, LLC \| Film rentals and advertising
Schedule of Equity Method Investments [Line Items]
Event fees		$ 9,031	0
Digital Cinema Distribution Coalition
Schedule of Equity Method Investments [Line Items]
Percentage of voting interest		14.60%
Payments for content delivery services		$ 542	$ 589