Screenvision Exhibition, Inc. - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 14, 2010	Sep. 30, 2011	Jan. 31, 2011	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Carrying value of ownership interest in SV Holdco				$ 6,471		$ 6,471		$ 5,079
Concessions and other				69,608	$ 62,459	226,699	$ 191,682
Amounts due included in accounts receivable related to Screenvision				9,909		9,909		$ 18,635
Class C Membership Units [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of issued and outstanding membership units received	20.00%
Threshold amount applicable for future profits and appreciation in assets	$ 85,000			$ 88,000		$ 88,000
Maximum forfeiture limit				25.00%
Maximum bonus units to be received				33.00%
Screenvision Exhibition, Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Exhibition agreement, expiration date				Jul. 01, 2012
Modified Exhibition Agreement, additional term				30 years
Modified Exhibition Agreement, expiration date				Jul. 01, 2042
Cash received on Modified Exhibition Agreement			$ 30,000
Non-forfeitable ownership interest at estimated fair value	6,555
Non-forfeitable Class C and Class A membership units				15.00%		15.00%		15.00%
Recognized concessions and other revenue received	30,000
Aggregate amount deferred to be recognized as concessions and other revenue	$ 36,555
Concessions and other				$ 2,600	2,800	$ 8,000	8,300
Intercompany gain to Company				459	$ 488	1,412	$ 1,469
Amounts due included in accounts receivable related to Screenvision				1,626		1,626		$ 3,085
SV Holdco, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Carrying value of ownership interest in SV Holdco				$ 5,430		$ 5,430		$ 4,195
SV Holdco, LLC [Member] | Member Units [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Class C and Class A membership units held				20.00%		20.00%
Carrying value of ownership interest in SV Holdco				$ 5,430		$ 5,430
SV Holdco, LLC [Member] | Class A Membership Units [Member]
Schedule of Equity Method Investments [Line Items]
Voluntary capital contribution made to SV Holdco		$ 718
SV Holdco, LLC [Member] | Class A Membership Units [Member] | Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of issued and outstanding membership units received		1.00%