Other Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	$ 89,059	$ 77,658
Other Affiliates
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	89,059	77,658
Digital Cinema Implementation Partners LLC | Other Affiliates
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	65,188	51,277
RealD
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	11,751	14,429
RealD | Other Affiliates
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	11,751	14,429
AC JV, LLC | Other Affiliates
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	8,923	7,899
Digital Cinema Distribution Coalition | Other Affiliates
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	2,562	2,438
Other Investment | Other Affiliates
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	$ 635	$ 1,615