Summary of Revenues Disaggregated Based on Timing of Revenue Recognition (Detail) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2020		Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenues		$ 35,478		$ 821,817	$ 588,068		$ 2,494,296
U.S. Operating Segment
Disaggregation of Revenue [Line Items]
Total revenues	[1]	34,409		633,045	470,007		1,930,787
International Operating Segment
Disaggregation of Revenue [Line Items]
Total revenues		1,069		188,772	118,061		563,509
Goods and Services Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total revenues		25,297		779,234	528,157		2,365,530
Goods and Services Transferred at a Point in Time | U.S. Operating Segment
Disaggregation of Revenue [Line Items]
Total revenues	[1]	24,945		610,063	426,476		1,860,828
Goods and Services Transferred at a Point in Time | International Operating Segment
Disaggregation of Revenue [Line Items]
Total revenues		352		169,171	101,681		504,702
Goods and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total revenues		10,181	[2]	42,583	59,911	[2]	128,766
Goods and Services Transferred Over Time | U.S. Operating Segment
Disaggregation of Revenue [Line Items]
Total revenues	[1]	9,464	[2]	22,982	43,531	[2]	69,959
Goods and Services Transferred Over Time | International Operating Segment
Disaggregation of Revenue [Line Items]
Total revenues		$ 717	[2]	$ 19,601	$ 16,380	[2]	$ 58,807

[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.