Revenue from Contracts with Customers - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,348,789	$ 2,427,515	$ 2,371,569
Retail Segment [Member]
Disaggregation of Revenue [Line Items]
Total revenues	1,751,415	1,813,907	1,742,172
Wholesale Segment [Member]
Disaggregation of Revenue [Line Items]
Total revenues	597,374	613,608	629,397
Party City Stores [Member] | Retail Segment [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,529,043	1,583,134	1,521,661
Global E-commerce [Member] | Retail Segment [Member]
Disaggregation of Revenue [Line Items]
Net sales	162,490	154,481	152,465
Temporary Stores [Member] | Retail Segment [Member]
Disaggregation of Revenue [Line Items]
Net sales	50,603	65,219	54,463
Domestic [Member] | Wholesale Segment [Member]
Disaggregation of Revenue [Line Items]
Net sales	310,042	328,056	351,109
International [Member] | Wholesale Segment [Member]
Disaggregation of Revenue [Line Items]
Net sales	287,332	285,552	278,288
Net Sales [Member]
Disaggregation of Revenue [Line Items]
Net sales	2,339,510	2,416,442	2,357,986
Net Sales [Member] | Retail Segment [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,742,136	1,802,834	1,728,589
Royalties and Franchise Fees [Member]
Disaggregation of Revenue [Line Items]
Net sales	9,279	11,073	13,583
Royalties and Franchise Fees [Member] | Retail Segment [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 9,279	$ 11,073	$ 13,583