Other Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	$ 87,731	$ 77,658
Investments
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	87,731	77,658
Digital Cinema Implementation Partners LLC | Investments
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	59,622	51,277
RealD
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	15,077	14,429
RealD | Investments
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	15,077	14,429
AC JV, LLC | Investments
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	8,874	7,899
Digital Cinema Distribution Coalition | Investments
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	2,562	2,438
Other Investment | Investments
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	$ 1,596	$ 1,615