Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Time-Based Units [Member]	Performance-Based Units [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Time-Based Units [Member]	Additional Paid-in Capital [Member] Performance-Based Units [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total Party City Holdco Inc. Stockholders' Equity Before Common Stock Held In Treasury [Member]	Total Party City Holdco Inc. Stockholders' Equity Before Common Stock Held In Treasury [Member] Time-Based Units [Member]	Total Party City Holdco Inc. Stockholders' Equity Before Common Stock Held In Treasury [Member] Performance-Based Units [Member]	Common Stock Held In Treasury [Member]	Total Party City Holdco Inc. Stockholders' Equity [Member]	Total Party City Holdco Inc. Stockholders' Equity [Member] Time-Based Units [Member]	Total Party City Holdco Inc. Stockholders' Equity [Member] Performance-Based Units [Member]	Non-Controlling Interests [Member]
Balance at Dec. 31, 2019	$ 529,721			$ 1,211	$ 928,573			$ (37,219)	$ (35,734)	$ 856,831			$ (327,086)	$ 529,745			$ (24)
Net income (loss)	(671,727)							(671,528)		(671,528)				(671,528)			(199)
Stock option expense		$ 560	$ 7,847			$ 560	$ 7,847				$ 560	$ 7,847			$ 560	$ 7,847
Restricted stock units		1,139				1,139					1,139				1,139
Director – non-cash compensation	75				75					75				75
Warrant expense	1,033				1,033					1,033				1,033
Treasury stock purchases	(84)												(84)	(84)
Acquired non-controlling interest	2,535				2,518					2,518				2,518			17
Foreign currency adjustments	(8,187)								(8,187)	(8,187)				(8,187)
Impact of foreign exchange contracts, net	72								72	72				72
Balance at Jun. 30, 2020	(137,016)			1,211	941,745			(708,747)	(43,849)	190,360			(327,170)	(136,810)			(206)
Balance at Mar. 31, 2020	(19,626)			1,211	933,174			(578,732)	(47,947)	307,706			(327,170)	(19,464)			(162)
Net income (loss)	(130,059)							(130,015)		(130,015)				(130,015)			(44)
Stock option expense		206	7,847			206	7,847				206	7,847			206	7,847
Restricted stock units		518				518					518				518
Foreign currency adjustments	4,014								4,014	4,014				4,014
Impact of foreign exchange contracts, net	84								84	84				84
Balance at Jun. 30, 2020	(137,016)			1,211	941,745			(708,747)	(43,849)	190,360			(327,170)	(136,810)			(206)
Balance at Dec. 31, 2020	50,521			1,373	971,972			(565,457)	(29,916)	377,972			(327,182)	50,790			(269)
Net income (loss)	(15,693)							(15,747)		(15,747)				(15,747)			(54)
Stock option expense	217					217					217				217
Restricted stock units		767	1,789			767	1,789				767	1,789				1,789
Director – non-cash compensation	114				114					114				114
Warrant exercise				4	(4)
Disposed non-controlling interest	(487)																(487)
Treasury stock purchases	(212)												(212)	(212)
Exercise of stock options	3,322			6	3,316					3,322				3,322
Foreign currency adjustments	37,397				(4)			17	37,360	37,373				37,373			24
Impact of foreign exchange contracts, net	(1,348)								(1,348)	(1,348)				(1,348)
Balance at Jun. 30, 2021	107,773			1,383	978,167			(549,693)	6,096	435,953			(327,394)	108,559			(786)
Balance at Mar. 31, 2021	74,894			1,383	976,037			(579,486)	5,134	403,068			(327,388)	75,680			(786)
Net income (loss)	29,811							29,811		29,811				29,811			0
Stock option expense		104				104					104				104
Restricted stock units		$ 415	$ 1,081			$ 415	$ 1,081				$ 415	$ 1,081			$ 415	$ 1,081
Director – non-cash compensation	57				57					57				57			0
Treasury stock purchases	(6)												(6)	(6)
Exercise of stock options	467				467					467				467
Foreign currency adjustments	950				6			(18)	962	950				950
Balance at Jun. 30, 2021	$ 107,773			$ 1,383	$ 978,167			$ (549,693)	$ 6,096	$ 435,953			$ (327,394)	$ 108,559			$ (786)