Quarterly report pursuant to Section 13 or 15(d)

Summary of Activity for Each of Company's Other Investments (Detail)

v3.8.0.1
Summary of Activity for Each of Company's Other Investments (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2013
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]          
Investments, beginning balance       $ 98,317  
Cash distributions [1]   $ (2,402) $ (1,391) (17,321) $ (9,660)
Equity in income   10,902 12,390 26,767 24,597
Equity in other comprehensive income   (11) $ (7) 92 $ (183)
Investments, ending balance   112,878   112,878  
AC JV, LLC          
Schedule of Equity Method Investments [Line Items]          
Cash contributions $ 268        
Other Affiliates          
Schedule of Equity Method Investments [Line Items]          
Investments, beginning balance       98,317  
Cash contributions       1,177  
Cash distributions       (5,212)  
Equity in income       18,669  
Equity in other comprehensive income       92  
Other       (165)  
Investments, ending balance   112,878   112,878  
Other Affiliates | Digital Cinema Implementation Partners          
Schedule of Equity Method Investments [Line Items]          
Investments, beginning balance       87,819  
Cash contributions       1,109  
Cash distributions       (5,212)  
Equity in income       16,820  
Equity in other comprehensive income       92  
Other       0  
Investments, ending balance   100,628   100,628  
Other Affiliates | AC JV, LLC          
Schedule of Equity Method Investments [Line Items]          
Investments, beginning balance       5,980  
Cash contributions       0  
Cash distributions       0  
Equity in income       996  
Equity in other comprehensive income       0  
Other       0  
Investments, ending balance   6,976   6,976  
Other Affiliates | Digital Cinema Distribution Coalition          
Schedule of Equity Method Investments [Line Items]          
Investments, beginning balance       2,750  
Cash contributions       0  
Cash distributions       0  
Equity in income       853  
Equity in other comprehensive income       0  
Other       0  
Investments, ending balance   3,603   3,603  
Other Affiliates | Other Investments          
Schedule of Equity Method Investments [Line Items]          
Investments, beginning balance       1,768  
Cash contributions       68  
Cash distributions       0  
Equity in income       0  
Equity in other comprehensive income       0  
Other       (165)  
Investments, ending balance   $ 1,671   $ 1,671  
[1] Includes cash distributions received from equity investees that were recorded as a reduction of the respective investment balances (see Notes 6 and 7). These distributions are reported entirely within the U.S. operating segment.