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Other Investments - Additional Information (Detail) $ / shares in Units, $ in Thousands		1 Months Ended		9 Months Ended		12 Months Ended	24 Months Ended
	Mar. 22, 2016 USD ($) $ / shares	Dec. 31, 2013 USD ($)	Mar. 31, 2011 $ / shares	Sep. 30, 2016 USD ($) ProjectionSystem	Sep. 30, 2015 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2011 shares
Schedule of Equity Method Investments [Line Items]
Number of options to purchase common stock \| shares							1,222,780
Exercise price of options, per share \| $ / shares			$ 0.00667
Proceeds from sale of marketable securities				$ 13,451
Other Affiliates
Schedule of Equity Method Investments [Line Items]
Cash contributions				$ 1,706
Other Affiliates \| Digital Cinema Implementation Partners
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				3,788
Cash contributions				$ 706
Other Affiliates \| RealD
Schedule of Equity Method Investments [Line Items]
Purchase price per share \| $ / shares	$ 11.00
Proceeds from sale of marketable securities	$ 13,451
Gain on investment				3,742
Unrealized holding gain previously recorded in AOCI				3,191
Other Affiliates \| 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
Original principal value of promissory note with NCM						$ 8,333
Annual interest rate on promissory note		5.00%				5.00%
Remaining outstanding balance of note payable				5,555
Other Affiliates \| AC JV, LLC \| Film rentals and advertising
Schedule of Equity Method Investments [Line Items]
Event fees				$ 7,808	$ 9,031
Other Affiliates \| Digital Cinema Distribution Coalition
Schedule of Equity Method Investments [Line Items]
Percentage of voting interest				14.60%
Payments for content delivery services				$ 707	$ 542