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Summary of Revenues Disaggregated Based on Timing of Revenue Recognition (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Total revenues $ 434,821 $ 35,478 $ 843,834 $ 588,068
U.S. Operating Segment        
Disaggregation of Revenue [Line Items]        
Total revenues [1] 375,527 34,409 741,877 470,007
International Operating Segment        
Disaggregation of Revenue [Line Items]        
Total revenues 59,294 1,069 101,957 118,061
Goods and Services Transferred at a Point in Time        
Disaggregation of Revenue [Line Items]        
Total revenues 401,790 25,297 769,964 528,157
Goods and Services Transferred at a Point in Time | U.S. Operating Segment        
Disaggregation of Revenue [Line Items]        
Total revenues [1] 348,484 24,945 678,445 426,476
Goods and Services Transferred at a Point in Time | International Operating Segment        
Disaggregation of Revenue [Line Items]        
Total revenues 53,306 352 91,519 101,681
Goods and Services Transferred Over Time        
Disaggregation of Revenue [Line Items]        
Total revenues [2] 33,031 10,181 73,870 59,911
Goods and Services Transferred Over Time | U.S. Operating Segment        
Disaggregation of Revenue [Line Items]        
Total revenues [1],[2] 27,043 9,464 63,432 43,531
Goods and Services Transferred Over Time | International Operating Segment        
Disaggregation of Revenue [Line Items]        
Total revenues [2] $ 5,988 $ 717 $ 10,438 $ 16,380
[1] U.S. segment revenues include eliminations of intercompany transactions with the international operating segment. See Note 17 for additional information on intercompany eliminations.
[2] Amount includes amortization of NCM screen advertising advances. See Deferred Revenues below.