Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales*	$ 535,746	$ 254,691	$ 962,553	$ 668,734
Cost of sales	318,574	237,907	593,095	534,664
Gross Profit	217,172	16,784	369,458	134,070
Wholesale selling expenses	7,358	9,707	16,474	25,165
Retail operating expenses	97,179	65,236	186,075	153,402
General and administrative expenses	45,795	63,955	91,833	129,289
Art and development costs	5,004	3,516	9,975	8,838
Store impairment and restructuring charges	0	1,164	0	18,892
Loss on disposal of assets in international operations		0	3,211	0
Goodwill, intangibles and long-lived assets impairment	0	0	0	536,648
Income (loss) from operations	61,836	(126,794)	61,890	(738,164)
Interest expense, net	23,116	25,412	40,330	50,532
Other (income) expense, net	(1,300)	1,484	(873)	7,160
Income (loss) before income taxes	40,020	(153,690)	22,433	(795,856)
Income tax expense (benefit)	10,209	(23,631)	6,740	(124,129)
Net income (loss)	29,811	(130,059)	15,693	(671,727)
Less: Net (loss) attributable to noncontrolling interests	0	(44)	(54)	(199)
Net (loss) attributable to common shareholders of Party City Holdco Inc.	$ 29,811	$ (130,015)	$ 15,747	$ (671,528)
Net income (loss) per share attributable to common shareholders of Party City Holdco Inc.-Basic	$ 0.27	$ (1.39)	$ 0.14	$ (7.19)
Net income (loss) per share attributable to common shareholders of Party City Holdco Inc.-Diluted	$ 0.26	$ (1.39)	$ 0.14	$ (7.19)
Weighted-average number of common shares-Basic	111,340,295	93,419,078	111,128,822	93,407,344
Weighted average shares - Diluted	116,251,151	93,419,078	115,499,304	93,407,344
Dividends declared per share	$ 0	$ 0	$ 0	$ 0
Comprehensive income (loss)	$ 30,761	$ (125,961)	$ 51,742	$ (679,842)
Less: Comprehensive (loss) attributable to noncontrolling interests	0	(44)	(30)	(199)
Comprehensive income (loss) attributable to common shareholders of Party City Holdco Inc.	$ 30,761	$ (125,917)	$ 51,772	$ (679,643)