Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap liabilities - current	$ (4,255)	[1]	$ (5,367)
Interest rate swap liabilities - long term	(317)	[2]	(3,809)
Investment in RealD	77,658		59,657
RealD
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in RealD	14,429		10,443
Level 1 | RealD
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in RealD	14,429		10,443
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap liabilities - current	(4,255)		(5,367)
Interest rate swap liabilities - long term	$ (317)		$ (3,809)

[1] Included in accrued other current liabilities on the consolidated balance sheet as of December 31, 2014.

[2] Included in other long-term liabilities on the consolidated balance sheet as of December 31, 2014.