Investment in National CineMedia - Additional Information (Detail) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) shares	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($)
Schedule Of Equity Method Investments [Line Items]
Equity in earnings	$ 6,414		$ 5,805	$ 15,050	$ 15,865
Number of additional common units of NCM received under common unit adjustment agreement | shares		908,042
Value of common units received from NCM		$ 5,012		$ 5,012	18,363
Remaining term of exhibitor services agreement		19 years
Number of common units of NCM owned by Company | shares	28,779,904			28,779,904
Interest in common units of NCM owned by Company	18.00%			18.00%
Investment In NCM
Schedule Of Equity Method Investments [Line Items]
Equity in earnings				$ 4,511
Common unit convertible into share of NCMI common stock, conversion ratio		1
Estimated fair value of investment using NCM's stock price	$ 241,751			$ 241,751
NCMI common stock price | $ / shares	$ 8.40			$ 8.40
NCM
Schedule Of Equity Method Investments [Line Items]
Equity in earnings	$ 495		$ 176	$ 4,511	3,065
Interest in common units of NCM owned by Company	18.00%			18.00%
NCM | Theatre Properties and Equipment
Schedule Of Equity Method Investments [Line Items]
Payment for installation of certain equipment used for digital advertising				$ 60	$ 50