Theatre Acquisitions - Additional Information (Detail) $ in Thousands				3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 26, 2014 USD ($) Theatre screen	Aug. 22, 2014 Theatre screen	Aug. 15, 2014 USD ($) Theatre screen States shares	Sep. 30, 2015 USD ($) Theatre screen	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) Theatre
Business Acquisition [Line Items]
Goodwill changes during period						$ 668
Goodwill recognized				$ 126,601				$ 126,601		$ 125,515
Revenue				180,241			$ 162,632	583,674	$ 504,542
Net loss				(6,257)			$ (6,757)	(7,311)	$ (6,699)
Increase (Decrease) in Deferred Income Taxes				(500)
Pipeline Theatres [Member]
Business Acquisition [Line Items]
Business acquisition, number of theatres acquired | Theatre	2	1								3
Business acquisition, number of screens acquired | screen	18	10
Business acquisition cash paid	$ 5,400
Goodwill changes during period										$ 3,250
Digiplex [Member]
Business Acquisition [Line Items]
Acquisition date			Aug. 15, 2014
Business acquisition, number of theatres acquired | Theatre			21
Business acquisition, number of screens acquired | screen			206
Business combination share exchange ratio			0.1765
Notes payable assumed and paid			$ 9,099
Business acquisition, cash paid			10,978
Business acquisition, cash paid held in escrow			$ 181
Business acquisition, share held in escrow | shares			30,000
Goodwill changes during period					$ 500	$ 468
Goodwill recognized			$ 43,148
Identifiable intangible assets recognized			2,190	2,190				2,190
Unfavorable lease obligations			$ 5,980	$ 5,980				5,980
Weighted-average useful life before extension or renewal				6 years 1 month 6 days
Revenue				$ 13,235				41,695
Net loss				$ 746				$ 2,747
Digiplex [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Business combination share exchange ratio			0.1765
Aggregate common stock | shares			1,382,000
Digiplex [Member] | UNITED STATES
Business Acquisition [Line Items]
Number of states in which acquired business operated | States			9
Digiplex [Member] | Start Media LLC Digiplex LLC (JV) [Member]
Business Acquisition [Line Items]
Percentage interest in joint venture			34.00%
Digiplex [Member] | Pipeline Theatres [Member]
Business Acquisition [Line Items]
Number of theatres agreed to acquire | Theatre				4
Number of screens agreed to acquire | screen				33
Start Media LLC [Member] | Start Media LLC Digiplex LLC (JV) [Member]
Business Acquisition [Line Items]
Percentage interest in joint venture			66.00%
Business acquisition, cash paid			$ 10,978