Summary of Revenues Disaggregated Based on Timing of Revenue Recognition (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021		Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenues		$ 114,361		$ 543,616
U.S. Operating Segment
Disaggregation of Revenue [Line Items]
Total revenues	[1]	97,089		427,443
International Operating Segment
Disaggregation of Revenue [Line Items]
Total revenues		17,272		116,173
Goods and Services Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total revenues		94,846		502,694
Goods and Services Transferred at a Point in Time | U.S. Operating Segment
Disaggregation of Revenue [Line Items]
Total revenues	[1]	80,534		401,442
Goods and Services Transferred at a Point in Time | International Operating Segment
Disaggregation of Revenue [Line Items]
Total revenues		14,312		101,252
Goods and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total revenues		19,515	[2]	40,922
Goods and Services Transferred Over Time | U.S. Operating Segment
Disaggregation of Revenue [Line Items]
Total revenues	[1]	16,555	[2]	26,001
Goods and Services Transferred Over Time | International Operating Segment
Disaggregation of Revenue [Line Items]
Total revenues		$ 2,960	[2]	$ 14,921

[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.