Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Jul. 26, 2021
Cover [Abstract]
Entity Registrant Name	Party City Holdco Inc.
Document Type	10-Q
Trading Symbol	PRTY
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		111,913,238
Amendment Flag	false
Entity Central Index Key	0001592058
Entity Filer Category	Accelerated Filer
Document Period End Date	Jun. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Security Exchange Name	NYSE
Entity File Number	001-37344
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	46-0539758
Entity Address, Address Line One	80 Grasslands Road
Entity Address, City or Town	Elmsford
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10523
City Area Code	914
Local Phone Number	345-2020
Document Quarterly Report	true
Document Transition Report	false
Title of 12(b) Security	Common Stock, Par Value: $0.01/share