Other Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	$ 100,621	$ 94,973
Other Affiliates
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	100,621	94,973
Digital Cinema Implementation Partners | Other Affiliates
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	88,108	71,579
AC JV, LLC | Other Affiliates
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	7,389	7,269
Digital Cinema Distribution Coalition | Other Affiliates
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	3,373	2,562
Other Investment | Other Affiliates
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	$ 1,751	$ 663