Other Investments - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2021 Studio
Maximum
Schedule Of Equity Method Investments [Line Items]
Percentage of voting interest	50.00%
Minimum
Schedule Of Equity Method Investments [Line Items]
Percentage of voting interest	20.00%
Digital Cinema Implementation Partners
Schedule Of Equity Method Investments [Line Items]
Percentage of voting interest	33.00%
Economic interest in Digital Cinema Implementation Partners	24.30%
Description of digital cinema deployment agreements	The DCDAs end on the earlier to occur of (i) the tenth anniversary of the "mean deployment date" for all digital projection systems scheduled to be deployed over a period of up to five years, or (ii) the date DCIP achieves "cost recoupment", each as defined in the DCDAs.
Number of major motion picture studio, long-term digital cinema deployment agreements	6
Digital Cinema Implementation Partners | Maximum
Schedule Of Equity Method Investments [Line Items]
Deployment period of digital cinema deployment agreements	5 years