Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap liabilities - current	$ (5,318)	[1]	$ (5,367)
Interest rate swap liabilities - long term	(520)	[2]	(3,809)
Investment in RealD	11,458		10,443
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in RealD	11,458		10,443
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap liabilities - current	(5,318)		(5,367)
Interest rate swap liabilities - long term	$ (520)		$ (3,809)

[1] Included in accounts payable and accrued expenses on the condensed consolidated balance sheet as of September 30, 2014.

[2] Included in other long-term liabilities on the condensed consolidated balance sheet as of September 30, 2014.