Acquisitions - Additional Information (Detail)			1 Months Ended	12 Months Ended
	Mar. 03, 2016 USD ($) $ / shares	Oct. 06, 2015 USD ($) Theatre screen	Jan. 31, 2016 USD ($) Theatre	Dec. 31, 2015 USD ($)	Sep. 30, 2016 USD ($)	Jul. 25, 2016 $ / shares shares
Business Acquisition [Line Items]
Goodwill				$ 151,716,000	$ 153,549,000
American Multi-Cinema [Member]
Business Acquisition [Line Items]
Share price (usd per share) | $ / shares	$ 30.00					$ 33.06
Business combination, consideration transferred, percentage of total shares to be converted Into cash						70.00%
Breakup fee	$ 30,000,000
Termination fee	$ 50,000,000
Business acquisition, number of theatres acquired | Theatre			2
Business acquisition, number of screens acquired | Theatre			22
Purchase price			$ 5,465,000
Working capital adjustment			75,000
Goodwill			$ 1,833,000
American Multi-Cinema [Member] | Common Class A [Member]
Business Acquisition [Line Items]
Business combination, conversion of stock, conversion ratio (in shares) | shares						1.0819
Business combination, consideration transferred, percentage of total shares to be converted into shares of acquiree						30.00%
Sundance Cinemas, LLC [Member]
Business Acquisition [Line Items]
Business acquisition, number of theatres acquired | Theatre		5
Business acquisition, number of screens acquired | screen		37
Purchase price		$ 35,843,000
Business acquisition cash paid		35,843,000
Working capital adjustment		130,000
Recognized identifiable assets acquired and liabilities assumed, liabilities		2,242,000
Goodwill		25,115,000
Intangible assets		200,000
Recognized identifiable assets acquired and liabilities assumed, noncurrent liabilities		$ 520,000
Weighted average useful life		5 years
Revenue recorded during period				7,394,000
Pro forma information, earnings or loss of acquiree since acquisition date				668,000
Acquisition related costs				$ 300,000