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Supplemental Information to Condensed Consolidated Statements of Cash Flows (Parenthetical) (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Supplemental Cash Flow Elements [Abstract]    
Additions to theatre properties and equipment included in accounts payable $ 25,841 $ 28,250