Theatre Acquisitions - Summary of the Preliminary Purchase Price Allocation Based on Deferred Income Tax (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Aug. 15, 2014
Business Acquisition [Line Items]
Goodwill	$ 126,601	$ 125,515
Digiplex [Member]
Business Acquisition [Line Items]
Total purchase price, net of cash received			$ 58,004
Accounts receivable			396
Other current assets			534
Property and equipment			25,126
Intangible assets	2,190		2,190
Other assets			521
Deferred tax assets			9,725
Accounts payable			(3,347)
Accrued expenses			(4,360)
Unfavorable lease obligations	$ (5,980)		(5,980)
Capital leases assumed			(850)
Assumption of Northlight term loan			(9,099)
Net assets acquired			14,856
Goodwill			$ 43,148